Add-on crash

[Livecan]

When I tried to run this add-on I was getting an error. I am not familiar with Anki add-ons or Python, but I thought this error message could help you.

Error
An error occurred. Please start Anki while holding down the shift key, which will temporarily disable the add-ons you have installed.
If the issue only occurs when add-ons are enabled, please use the Tools > Add-ons menu item to disable some add-ons and restart Anki, repeating until you discover the add-on that is causing the problem.
When you've discovered the add-on that is causing the problem, please report the issue on the add-on support site.
Debug info:
Anki 2.1.32 (dee7d45d) Python 3.8.0 Qt 5.14.1 PyQt 5.14.1
Platform: Windows 10
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2020-09-08 15:39:37

Caught exception:
Traceback (most recent call last):
File "aqt\webview.py", line 37, in cmd
File "aqt\webview.py", line 123, in _onCmd
File "aqt\webview.py", line 547, in _onBridgeCmd
File "aqt\overview.py", line 67, in _linkHandler
File "aqt\main.py", line 661, in moveToState
File "aqt\main.py", line 683, in _reviewState
File "aqt\reviewer.py", line 65, in show
File "aqt\reviewer.py", line 118, in nextCard
File "aqt\reviewer.py", line 208, in _showQuestion
File "aqt\gui_hooks.py", line 2127, in call
File "anki\hooks.py", line 583, in runHook
File "C:\Users\roman\AppData\Roaming\Anki2\addons21\flashgrid\reviewerMonkey.py", line 60, in onShowQuestion
doGrid()
File "C:\Users\roman\AppData\Roaming\Anki2\addons21\flashgrid\reviewerMonkey.py", line 51, in doGrid
w.setGeo()
File "C:\Users\roman\AppData\Roaming\Anki2\addons21\flashgrid\main.py", line 108, in setGeo
screen = QDesktopWidget().screenGeometry()
NameError: name 'QDesktopWidget' is not defined