Improve restore needed error message

[livarcocc]

The below is what we get today. I think we should at least find a way to remove the junk error messages about types not found and leave only the last piece which talks about the assets file not existing.

Also, maybe we could put in there a more actionable message, like run dotnet restore, or something like that.

dotnet build
Microsoft (R) Build Engine version 15.1.458.808
Copyright (C) Microsoft Corporation. All rights reserved.

/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(4,20): error CS0400: The type or namespace name 'System' could not be found in the global namespace (are you missing an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(6,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(7,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(8,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(9,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(10,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(11,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(12,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(13,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(14,12): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(4,71): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(4,99): error CS0246: The type or namespace name 'FrameworkDisplayName' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(4,122): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(6,55): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(7,61): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(8,59): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(9,59): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(10,68): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(11,55): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(12,53): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(13,55): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(14,63): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(1,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(2,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(3,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(4,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(5,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(6,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(1,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(2,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(3,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(4,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(5,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(6,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(7,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(8,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(9,7): error CS0246: The type or namespace name 'Microsoft' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(2,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/var/folders/qw/s8blrphs09jb9nh0x9x6bjpr0000gn/T/.NETCoreApp,Version=v1.0.AssemblyAttributes.cs(3,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(3,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
obj/Debug/netcoreapp1.0/AspNetCoreWebApp_OnCore_Empty_1.AssemblyInfo.cs(4,7): error CS0246: The type or namespace name 'System' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(13,18): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(10,18): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(17,39): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(17,39): error CS0246: The type or namespace name 'IServiceCollection' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(17,16): error CS0518: Predefined type 'System.Void' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,31): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,31): error CS0246: The type or namespace name 'IApplicationBuilder' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,56): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,56): error CS0246: The type or namespace name 'IHostingEnvironment' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,81): error CS0518: Predefined type 'System.Object' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,81): error CS0246: The type or namespace name 'ILoggerFactory' could not be found (are you missing a using directive or an assembly reference?) [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Startup.cs(22,16): error CS0518: Predefined type 'System.Void' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(12,33): error CS0518: Predefined type 'System.String' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
Program.cs(12,23): error CS0518: Predefined type 'System.Void' is not defined or imported [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]
/Users/livarcocc/Documents/git/cli/artifacts/osx.10.11-x64/stage2/sdk/1.0.0-preview5-004316/Sdks/Microsoft.NET.Sdk/build/Microsoft.NET.Sdk.targets(82,5): error : Assets file '/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/obj/project.assets.json' not found. Run a NuGet package restore to generate this file. [/Users/livarcocc/Documents/git/ProjectKTestProjects/Dev14_K101/Tooling202/AspNetCoreWebApp_OnCore_Empty_1/src/AspNetCoreWebApp_OnCore_Empty_1/AspNetCoreWebApp_OnCore_Empty_1.csproj]

[davidfowl]

This is the exact same s thing we do in the CLI with project.json. Building without an assets file leads to an error. This should be part of the diagnostic work

[natemcmaster]

👍

Maybe it's just me, but it seems like I often make changes to a csproj file and forget to run "dotnet restore" before building again. This often means the SDK explodes with the wrath of a 1000 lines of red text.

Would be nice if it could just simply say: "please re-run restore", as it used to project.json

vs