macOS Big Sur - Workbooks Crashes After Selecting Workbook Type

[adamzucchi]

Steps to Reproduce

1. Open Workbooks (v 1.5) on macOS Big Sur
2. Select a Workbook type, such as "Console"
3. Workbooks crashes

Expected Behavior

A new Workbook for the given type would open.

Actual Behavior

Workbooks crashes

Environment

Xamarin Workbooks

Detail	Value
Version	1.5.0
Git Branch	1.5-release
Git Hash	11f83dc
VSTS Definition	Workbooks & Inspector (Mac)

System Info

Component	Value
macOS	Version 10.16 (Build 20B50) (64-bit)
CPU Cores	12 / 12
Physical Memory	32 GB

System-Installed Software

Component	Version
Mono	6.12.0.93
Xamarin Mac	7.0.0.15
Xamarin iOS	14.4.1.3
Xamarin Android	11.1.0-17
Visual Studio	8.8.1.37 (808010037)

Log File

Xamarin Workbooks 2020-11-24.log

[gukoff]

I have the same problem.

[yauhenipakala]

Apple Crash Report:

Process:               Xamarin Workbooks [49434]
Path:                  /Applications/Xamarin Workbooks.app/Contents/MacOS/Xamarin Workbooks
Identifier:            com.xamarin.Workbooks
Version:               1.5 (1.5)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Xamarin Workbooks [49434]
User ID:               501

Date/Time:             2021-01-31 15:25:01.535 +0300
OS Version:            macOS 11.1 (20C69)
Report Version:        12
Bridge OS Version:     5.1 (18P3030)
Anonymous UUID:        D9C65E1B-C141-4BE7-A8DC-3BE860CFCB62

Sleep/Wake UUID:       62535554-A50D-4625-ABBE-B7C2AB9FBF50

Time Awake Since Boot: 1500000 seconds
Time Since Wake:       2600 seconds

System Integrity Protection: enabled

Crashed Thread:        0  tid_307  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
Performing @selector(createWorkbook:) from sender NSButton 0x7fb2d4725630
*** Terminating app due to uncaught exception 'NSGenericException', reason: 'Unable to install constraint on view.  Does the constraint reference something from outside the subtree of the view?  That's illegal. constraint:<NSLayoutConstraint:0x600002333520 NSView:0x7fb2de697790.centerX == NSToolbarItemViewer:0x7fb2de689600.centerX   (active)> view:<NSToolbarItemViewer: 0x7fb2de689600 'xi-toolbar-centering-spacer'>'
abort() called
terminating with uncaught exception of type NSException

Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff204f06af __exceptionPreprocess + 242
1   libobjc.A.dylib                     0x00007fff202283c9 objc_exception_throw + 48
2   CoreAutoLayout                      0x00007fff271df0b7 -[NSLayoutConstraint _addToEngine:] + 0
3   AppKit                              0x00007fff22cf2586 -[NSView(NSConstraintBasedLayout) _layoutEngine_didAddLayoutConstraint:integralizationAdjustment:mutuallyExclusiveConstraints:] + 91
4   AppKit                              0x00007fff22cf2344 -[NSView(NSConstraintBasedLayout) _tryToAddConstraint:integralizationAdjustment:mutuallyExclusiveConstraints:] + 272
5   AppKit                              0x00007fff22d00369 __50-[NSView(NSConstraintBasedLayout) addConstraints:]_block_invoke + 183
6   CoreAutoLayout                      0x00007fff271c63fa -[NSISEngine withBehaviors:performModifications:] + 84
7   AppKit                              0x00007fff22caad56 -[NSView(NSConstraintBasedLayout) _withAutomaticEngineOptimizationDisabled:] + 59
8   AppKit                              0x00007fff22cff9d0 -[NSView(NSConstraintBasedLayout) addConstraints:] + 141
9   AppKit                              0x00007fff22d9afd7 -[NSToolbarItemViewer configureForLayoutInDisplayMode:andSizeMode:inToolbarView:] + 3998
10  AppKit                              0x00007fff22d98267 -[NSToolbarView _layoutDirtyItemViewersAndTileToolbar] + 1389
11  AppKit                              0x00007fff22d944b0 -[NSToolbarView _syncItemSetAndUpdateItemViewersWithSEL:setNeedsModeConfiguration:sizeToFit:setNeedsDisplay:updateKeyLoop:] + 166
12  AppKit                              0x00007fff22d943ff -[NSToolbarView _noteToolbarLayoutChanged] + 90
13  AppKit                              0x00007fff22caaa91 -[NSView _setWindow:] + 1790
14  AppKit                              0x00007fff22cb3cd6 -[NSView addSubview:] + 194
15  AppKit                              0x00007fff22cc72f0 -[NSThemeFrame addTitlebarSubview:] + 103
16  AppKit                              0x00007fff22d93e51 -[NSThemeFrame _showHideToolbar:resizeWindow:animate:] + 85
17  AppKit                              0x00007fff22d82b80 -[NSWindow _showToolbar:animate:] + 214
18  AppKit                              0x00007fff22d82a97 -[NSToolbar _show:animate:] + 35
19  AppKit                              0x00007fff22d806b8 -[NSWindow setToolbar:] + 730
20  ???                                 0x000000010ec1ab3b 0x0 + 4542540603
21  Xamarin Workbooks                   0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
22  Xamarin Workbooks                   0x0000000105febb5f mono_runtime_invoke_checked + 127
23  Xamarin Workbooks                   0x0000000105ff0473 mono_runtime_invoke + 83
24  Xamarin Workbooks                   0x000000010610860d _ZL31native_to_managed_trampoline_14P11objc_objectP13objc_selectorPP11_MonoMethodj + 237
25  Xamarin Workbooks                   0x0000000106166b74 -[SessionWindowController windowDidLoad] + 52
26  AppKit                              0x00007fff22e6bb4a -[NSWindowController _windowDidLoad] + 570
27  CoreFoundation                      0x00007fff2046b4c9 -[NSSet makeObjectsPerformSelector:] + 231
28  AppKit                              0x00007fff22c70a18 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 1320
29  AppKit                              0x00007fff22cf0130 -[NSNib _instantiateNibWithExternalNameTable:options:] + 642
30  AppKit                              0x00007fff22cefdb9 -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 143
31  AppKit                              0x00007fff23492162 -[NSStoryboard _instantiateControllerWithIdentifier:creator:storyboardSegueTemplate:sender:] + 470
32  ???                                 0x000000010e528ffb 0x0 + 4535259131
33  Xamarin Workbooks                   0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
34  Xamarin Workbooks                   0x0000000105febb5f mono_runtime_invoke_checked + 127
35  Xamarin Workbooks                   0x0000000105ff0473 mono_runtime_invoke + 83
36  Xamarin Workbooks                   0x000000010610860d _ZL31native_to_managed_trampoline_14P11objc_objectP13objc_selectorPP11_MonoMethodj + 237
37  Xamarin Workbooks                   0x0000000106171eb4 -[SessionDocument makeWindowControllers] + 52
38  AppKit                              0x00007fff232187ec -[NSDocumentController _finishOpeningDocument:andShowWindows:] + 75
39  AppKit                              0x00007fff2321e862 -[NSDocumentController(NSDeprecated) openDocumentWithContentsOfURL:display:error:] + 903
40  ???                                 0x000000012014c796 0x0 + 4833200022
41  ???                                 0x00000001201485e5 0x0 + 4833183205
42  Xamarin Workbooks                   0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
43  Xamarin Workbooks                   0x0000000105febb5f mono_runtime_invoke_checked + 127
44  Xamarin Workbooks                   0x0000000105ff0473 mono_runtime_invoke + 83
45  Xamarin Workbooks                   0x0000000106106408 _ZL30native_to_managed_trampoline_9P11objc_objectP13objc_selectorPP11_MonoMethodP8NSObjectj + 408
46  Xamarin Workbooks                   0x00000001061759f8 -[NewWorkbookViewController createWorkbook:] + 56
47  AppKit                              0x00007fff22eb2c4e -[NSApplication(NSResponder) sendAction:to:from:] + 283
48  AppKit                              0x00007fff22eb2af9 -[NSControl sendAction:to:] + 86
49  AppKit                              0x00007fff22eb2a2b __26-[NSCell _sendActionFrom:]_block_invoke + 131
50  AppKit                              0x00007fff22eb2932 -[NSCell _sendActionFrom:] + 171
51  AppKit                              0x00007fff22eb287a -[NSButtonCell _sendActionFrom:] + 96
52  AppKit                              0x00007fff22eaf959 NSControlTrackMouse + 1757
53  AppKit                              0x00007fff22eaf254 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 130
54  AppKit                              0x00007fff22eaf119 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 697
55  AppKit                              0x00007fff22eae452 -[NSControl mouseDown:] + 722
56  AppKit                              0x00007fff22eac8a4 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4956
57  AppKit                              0x00007fff22e1c028 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2594
58  AppKit                              0x00007fff22e1b3ea -[NSWindow(NSEventRouting) sendEvent:] + 347
59  AppKit                              0x00007fff22e197d4 -[NSApplication(NSEvent) sendEvent:] + 352
60  AppKit                              0x00007fff230f236e -[NSApplication _handleEvent:] + 65
61  AppKit                              0x00007fff22c82b2f -[NSApplication run] + 623
62  AppKit                              0x00007fff22c56df2 NSApplicationMain + 816
63  ???                                 0x00000001085b2e70 0x0 + 4435160688
64  ???                                 0x00000001085b2d03 0x0 + 4435160323
65  Xamarin Workbooks                   0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
66  Xamarin Workbooks                   0x0000000105febb5f mono_runtime_invoke_checked + 127
67  Xamarin Workbooks                   0x0000000105ff29de mono_runtime_exec_main_checked + 110
68  Xamarin Workbooks                   0x0000000105e4ed59 mono_jit_exec + 297
69  Xamarin Workbooks                   0x0000000105e51d54 mono_main + 11156
70  Xamarin Workbooks                   0x0000000105deefe9 xamarin_main + 1305
71  Xamarin Workbooks                   0x0000000105deffb4 main + 36
72  libdyld.dylib                       0x00007fff20399621 start + 1

Thread 0 Crashed:: tid_307  Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff20350462 __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff2037e610 pthread_kill + 263
2   libsystem_c.dylib             	0x00007fff202d17ba __abort + 139
3   libsystem_c.dylib             	0x00007fff202d172f abort + 135
4   libc++abi.dylib               	0x00007fff20343418 abort_message + 231
5   libc++abi.dylib               	0x00007fff20334a7d demangling_terminate_handler() + 266
6   libobjc.A.dylib               	0x00007fff2022a9b1 _objc_terminate() + 96
7   libc++abi.dylib               	0x00007fff20342847 std::__terminate(void (*)()) + 8
8   libc++abi.dylib               	0x00007fff2034534d __cxa_rethrow + 99
9   libobjc.A.dylib               	0x00007fff20228747 objc_exception_rethrow + 37
10  com.apple.AppKit              	0x00007fff22cb3e86 -[NSView addSubview:] + 626
11  com.apple.AppKit              	0x00007fff22cc72f0 -[NSThemeFrame addTitlebarSubview:] + 103
12  com.apple.AppKit              	0x00007fff22d93e51 -[NSThemeFrame _showHideToolbar:resizeWindow:animate:] + 85
13  com.apple.AppKit              	0x00007fff22d82b80 -[NSWindow _showToolbar:animate:] + 214
14  com.apple.AppKit              	0x00007fff22d82a97 -[NSToolbar _show:animate:] + 35
15  com.apple.AppKit              	0x00007fff22d806b8 -[NSWindow setToolbar:] + 730
16  ???                           	0x000000010ec1ab3b 0 + 4542540603
17  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
18  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
19  com.xamarin.Workbooks         	0x0000000105ff0473 mono_runtime_invoke + 83
20  com.xamarin.Workbooks         	0x000000010610860d native_to_managed_trampoline_14(objc_object*, objc_selector*, _MonoMethod**, unsigned int) + 237
21  com.xamarin.Workbooks         	0x0000000106166b74 -[SessionWindowController windowDidLoad] + 52
22  com.apple.AppKit              	0x00007fff22e6bb4a -[NSWindowController _windowDidLoad] + 570
23  com.apple.CoreFoundation      	0x00007fff2046b4c9 -[NSSet makeObjectsPerformSelector:] + 231
24  com.apple.AppKit              	0x00007fff22c70a18 -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 1320
25  com.apple.AppKit              	0x00007fff22cf0130 -[NSNib _instantiateNibWithExternalNameTable:options:] + 642
26  com.apple.AppKit              	0x00007fff22cefdb9 -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 143
27  com.apple.AppKit              	0x00007fff23492162 -[NSStoryboard _instantiateControllerWithIdentifier:creator:storyboardSegueTemplate:sender:] + 470
28  ???                           	0x000000010e528ffb 0 + 4535259131
29  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
30  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
31  com.xamarin.Workbooks         	0x0000000105ff0473 mono_runtime_invoke + 83
32  com.xamarin.Workbooks         	0x000000010610860d native_to_managed_trampoline_14(objc_object*, objc_selector*, _MonoMethod**, unsigned int) + 237
33  com.xamarin.Workbooks         	0x0000000106171eb4 -[SessionDocument makeWindowControllers] + 52
34  com.apple.AppKit              	0x00007fff232187ec -[NSDocumentController _finishOpeningDocument:andShowWindows:] + 75
35  com.apple.AppKit              	0x00007fff2321e862 -[NSDocumentController(NSDeprecated) openDocumentWithContentsOfURL:display:error:] + 903
36  ???                           	0x000000012014c796 0 + 4833200022
37  ???                           	0x00000001201485e5 0 + 4833183205
38  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
39  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
40  com.xamarin.Workbooks         	0x0000000105ff0473 mono_runtime_invoke + 83
41  com.xamarin.Workbooks         	0x0000000106106408 native_to_managed_trampoline_9(objc_object*, objc_selector*, _MonoMethod**, NSObject*, unsigned int) + 408
42  com.xamarin.Workbooks         	0x00000001061759f8 -[NewWorkbookViewController createWorkbook:] + 56
43  com.apple.AppKit              	0x00007fff22eb2c4e -[NSApplication(NSResponder) sendAction:to:from:] + 283
44  com.apple.AppKit              	0x00007fff22eb2af9 -[NSControl sendAction:to:] + 86
45  com.apple.AppKit              	0x00007fff22eb2a2b __26-[NSCell _sendActionFrom:]_block_invoke + 131
46  com.apple.AppKit              	0x00007fff22eb2932 -[NSCell _sendActionFrom:] + 171
47  com.apple.AppKit              	0x00007fff22eb287a -[NSButtonCell _sendActionFrom:] + 96
48  com.apple.AppKit              	0x00007fff22eaf959 NSControlTrackMouse + 1757
49  com.apple.AppKit              	0x00007fff22eaf254 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 130
50  com.apple.AppKit              	0x00007fff22eaf119 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 697
51  com.apple.AppKit              	0x00007fff22eae452 -[NSControl mouseDown:] + 722
52  com.apple.AppKit              	0x00007fff22eac8a4 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 4956
53  com.apple.AppKit              	0x00007fff22e1c028 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2594
54  com.apple.AppKit              	0x00007fff22e1b3ea -[NSWindow(NSEventRouting) sendEvent:] + 347
55  com.apple.AppKit              	0x00007fff22e197d4 -[NSApplication(NSEvent) sendEvent:] + 352
56  com.apple.AppKit              	0x00007fff230f236e -[NSApplication _handleEvent:] + 65
57  com.apple.AppKit              	0x00007fff22c82b2f -[NSApplication run] + 623
58  com.apple.AppKit              	0x00007fff22c56df2 NSApplicationMain + 816
59  ???                           	0x00000001085b2e70 0 + 4435160688
60  ???                           	0x00000001085b2d03 0 + 4435160323
61  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
62  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
63  com.xamarin.Workbooks         	0x0000000105ff29de mono_runtime_exec_main_checked + 110
64  com.xamarin.Workbooks         	0x0000000105e4ed59 mono_jit_exec + 297
65  com.xamarin.Workbooks         	0x0000000105e51d54 mono_main + 11156
66  com.xamarin.Workbooks         	0x0000000105deefe9 xamarin_main + 1305
67  com.xamarin.Workbooks         	0x0000000105deffb4 main + 36
68  libdyld.dylib                 	0x00007fff20399621 start + 1

Thread 1:: JavaScriptCore bmalloc scavenger
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037ee6f _pthread_cond_wait + 1254
2   libc++.1.dylib                	0x00007fff202e5d83 std::__1::condition_variable::__do_timed_wait(std::__1::unique_lock<std::__1::mutex>&, std::__1::chrono::time_point<std::__1::chrono::system_clock, std::__1::chrono::duration<long long, std::__1::ratio<1l, 1000000000l> > >) + 93
3   com.apple.JavaScriptCore      	0x00007fff3748d7ab bmalloc::Scavenger::threadRunLoop() + 763
4   com.apple.JavaScriptCore      	0x00007fff3748d189 bmalloc::Scavenger::threadEntryPoint(bmalloc::Scavenger*) + 9
5   com.apple.JavaScriptCore      	0x00007fff3748fb37 void* std::__1::__thread_proxy<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct> >, void (*)(bmalloc::Scavenger*), bmalloc::Scavenger*> >(void*) + 39
6   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
7   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 2:: SGen worker
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037ee6f _pthread_cond_wait + 1254
2   com.xamarin.Workbooks         	0x00000001060b4403 thread_func + 547
3   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
4   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 3:: Finalizer
0   libsystem_kernel.dylib        	0x00007fff20349eba semaphore_wait_trap + 10
1   com.xamarin.Workbooks         	0x0000000105f88295 finalizer_thread + 293
2   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
3   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
4   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 4:: tid_6303
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037ee6f _pthread_cond_wait + 1254
2   com.xamarin.Workbooks         	0x00000001060c6b90 mono_os_cond_timedwait + 112
3   com.xamarin.Workbooks         	0x000000010605f504 mono_w32handle_timedwait_signal_handle + 180
4   com.xamarin.Workbooks         	0x000000010605f3e6 mono_w32handle_wait_one + 758
5   com.xamarin.Workbooks         	0x000000010605f641 mono_w32handle_wait_multiple + 193
6   com.xamarin.Workbooks         	0x000000010603cc2f ves_icall_System_Threading_WaitHandle_Wait_internal + 159
7   ???                           	0x000000010e74164d 0 + 4537456205
8   ???                           	0x000000010e74112b 0 + 4537454891
9   ???                           	0x000000010e73ce45 0 + 4537437765
10  ???                           	0x000000010e533023 0 + 4535300131
11  ???                           	0x000000010e53243b 0 + 4535297083
12  ???                           	0x000000010e5318b3 0 + 4535294131
13  ???                           	0x000000010e53243b 0 + 4535297083
14  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
15  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
16  com.xamarin.Workbooks         	0x000000010604231a start_wrapper_internal + 602
17  com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
18  libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
19  libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 5:: Thread Pool I/O Selector
0   libsystem_kernel.dylib        	0x00007fff203521fe __select + 10
1   com.xamarin.Workbooks         	0x00000001060c7199 mono_poll + 377
2   com.xamarin.Workbooks         	0x00000001060340b0 poll_event_wait + 192
3   com.xamarin.Workbooks         	0x00000001060339b3 selector_thread + 1267
4   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
5   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
6   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
7   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 6:: tid_9403
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037ee6f _pthread_cond_wait + 1254
2   com.xamarin.Workbooks         	0x00000001060c6b90 mono_os_cond_timedwait + 112
3   com.xamarin.Workbooks         	0x000000010605f504 mono_w32handle_timedwait_signal_handle + 180
4   com.xamarin.Workbooks         	0x000000010605f3e6 mono_w32handle_wait_one + 758
5   com.xamarin.Workbooks         	0x000000010605f641 mono_w32handle_wait_multiple + 193
6   com.xamarin.Workbooks         	0x000000010603cc2f ves_icall_System_Threading_WaitHandle_Wait_internal + 159
7   ???                           	0x000000010e74164d 0 + 4537456205
8   ???                           	0x000000010e74112b 0 + 4537454891
9   ???                           	0x000000010e847deb 0 + 4538531307
10  ???                           	0x000000010e53243b 0 + 4535297083
11  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
12  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
13  com.xamarin.Workbooks         	0x000000010604231a start_wrapper_internal + 602
14  com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
15  libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
16  libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 7:: Timer-Scheduler
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037eea2 _pthread_cond_wait + 1305
2   com.xamarin.Workbooks         	0x00000001060c6b74 mono_os_cond_timedwait + 84
3   com.xamarin.Workbooks         	0x000000010605f504 mono_w32handle_timedwait_signal_handle + 180
4   com.xamarin.Workbooks         	0x000000010605f3e6 mono_w32handle_wait_one + 758
5   com.xamarin.Workbooks         	0x000000010605f641 mono_w32handle_wait_multiple + 193
6   com.xamarin.Workbooks         	0x000000010603cc2f ves_icall_System_Threading_WaitHandle_Wait_internal + 159
7   ???                           	0x000000010e74164d 0 + 4537456205
8   ???                           	0x000000010e74112b 0 + 4537454891
9   ???                           	0x000000010e73cbe7 0 + 4537437159
10  ???                           	0x000000010e53243b 0 + 4535297083
11  com.xamarin.Workbooks         	0x0000000105ef01a1 mono_jit_runtime_invoke + 1441
12  com.xamarin.Workbooks         	0x0000000105febb5f mono_runtime_invoke_checked + 127
13  com.xamarin.Workbooks         	0x000000010604231a start_wrapper_internal + 602
14  com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
15  libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
16  libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 8:: com.apple.NSURLConnectionLoader
0   libsystem_kernel.dylib        	0x00007fff20349e7e mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fff2034a1f0 mach_msg + 60
2   com.apple.CoreFoundation      	0x00007fff20476bf7 __CFRunLoopServiceMachPort + 316
3   com.apple.CoreFoundation      	0x00007fff204752ca __CFRunLoopRun + 1315
4   com.apple.CoreFoundation      	0x00007fff204746ce CFRunLoopRunSpecific + 563
5   com.apple.CFNetwork           	0x00007fff248f8132 0x7fff246b8000 + 2359602
6   com.apple.Foundation          	0x00007fff211fae1d __NSThread__start__ + 1042
7   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
8   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 9:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	0x00007fff20349e7e mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fff2034a1f0 mach_msg + 60
2   com.apple.CoreFoundation      	0x00007fff20476bf7 __CFRunLoopServiceMachPort + 316
3   com.apple.CoreFoundation      	0x00007fff204752ca __CFRunLoopRun + 1315
4   com.apple.CoreFoundation      	0x00007fff204746ce CFRunLoopRunSpecific + 563
5   com.apple.AppKit              	0x00007fff22e17c16 _NSEventThread + 124
6   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
7   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 10:: LocalStorage
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037ee6f _pthread_cond_wait + 1254
2   com.apple.JavaScriptCore      	0x00007fff374161f2 WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) + 3762
3   com.apple.WebKitLegacy        	0x00007fff34cf44aa bool WTF::Condition::waitUntil<WTF::Lock>(WTF::Lock&, WTF::TimeWithDynamicClockType const&) + 154
4   com.apple.WebKitLegacy        	0x00007fff34cf7933 std::__1::unique_ptr<WTF::Function<void ()>, std::__1::default_delete<WTF::Function<void ()> > > WTF::MessageQueue<WTF::Function<void ()> >::waitForMessageFilteredWithTimeout<WTF::MessageQueue<WTF::Function<void ()> >::waitForMessage()::'lambda'(WTF::Function<void ()> const&)>(WTF::MessageQueueWaitResult&, WTF::MessageQueue<WTF::Function<void ()> >::waitForMessage()::'lambda'(WTF::Function<void ()> const&)&&, WTF::Seconds) + 147
5   com.apple.WebKitLegacy        	0x00007fff34cf70a6 WebCore::StorageThread::threadEntryPoint() + 86
6   com.apple.JavaScriptCore      	0x00007fff374357af WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 223
7   com.apple.JavaScriptCore      	0x00007fff36468819 WTF::wtfThreadEntryPoint(void*) + 9
8   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
9   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 11:: tid_12a77
0   libsystem_pthread.dylib       	0x00007fff2037a458 start_wqthread + 0

Thread 12:
0   libsystem_pthread.dylib       	0x00007fff2037a458 start_wqthread + 0

Thread 13:
0   libsystem_pthread.dylib       	0x00007fff2037a458 start_wqthread + 0

Thread 14:
0   libsystem_pthread.dylib       	0x00007fff2037a458 start_wqthread + 0

Thread 15:
0   libsystem_pthread.dylib       	0x00007fff2037a458 start_wqthread + 0

Thread 16:: tid_185a3
0   libsystem_kernel.dylib        	0x00007fff2034c8e2 __psynch_cvwait + 10
1   libsystem_pthread.dylib       	0x00007fff2037eea2 _pthread_cond_wait + 1305
2   com.xamarin.Workbooks         	0x00000001060c6b74 mono_os_cond_timedwait + 84
3   com.xamarin.Workbooks         	0x00000001060ced47 mono_thread_info_sleep + 679
4   com.xamarin.Workbooks         	0x0000000106036f43 monitor_thread + 163
5   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
6   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
7   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
8   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 17:: Thread Pool Worker
0   libsystem_kernel.dylib        	0x00007fff20349ed2 semaphore_timedwait_trap + 10
1   com.xamarin.Workbooks         	0x0000000106037795 worker_thread + 805
2   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
3   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
4   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 18:: Thread Pool Worker
0   libsystem_kernel.dylib        	0x00007fff20349ed2 semaphore_timedwait_trap + 10
1   com.xamarin.Workbooks         	0x0000000106037795 worker_thread + 805
2   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
3   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
4   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 19:: Thread Pool Worker
0   libsystem_kernel.dylib        	0x00007fff20349ed2 semaphore_timedwait_trap + 10
1   com.xamarin.Workbooks         	0x0000000106037795 worker_thread + 805
2   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
3   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
4   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 20:: tid_5e07
0   libsystem_kernel.dylib        	0x00007fff20349ed2 semaphore_timedwait_trap + 10
1   com.xamarin.Workbooks         	0x0000000106037795 worker_thread + 805
2   com.xamarin.Workbooks         	0x0000000106042239 start_wrapper_internal + 377
3   com.xamarin.Workbooks         	0x0000000106042097 start_wrapper + 71
4   libsystem_pthread.dylib       	0x00007fff2037e950 _pthread_start + 224
5   libsystem_pthread.dylib       	0x00007fff2037a47b thread_start + 15

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x000000010681be00  rcx: 0x00007ffee9e47388  rdx: 0x0000000000000000
  rdi: 0x0000000000000307  rsi: 0x0000000000000006  rbp: 0x00007ffee9e473b0  rsp: 0x00007ffee9e47388
   r8: 0x0000000000000000   r9: 0x0000000000989680  r10: 0x000000010681be00  r11: 0x0000000000000246
  r12: 0x0000000000000307  r13: 0x0000003000000008  r14: 0x0000000000000006  r15: 0x0000000000000016
  rip: 0x00007fff20350462  rfl: 0x0000000000000246  cr2: 0x00000001064642a0
  
Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133

[lnaie]

Fix your stuff, guys. This is half a year later.

[neolib]

Same problem here. Crashes every time!

[metalfork]

Same here. BigSur is garbage but so is this constant crashing.

[daedalus-codes]

Just noticed this the last month for so, it's disappointing. I used it similar to LinqPad on Windows to sandbox prototyping some ideas and to isolate testing some code behavior. I thought I messed it up after an attempt to uninstall/reinstall VS for Mac.