No response from ANKI after deleting an add-on

After I deleted an add-on, I failed to close the ANKI and an Error popped up. There is no response when I clicked any buttons on ANKI (e.g. study now, create deck…). Does anyone know what is happening? Thx.

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, repeat 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-ons section of our support site.
Debug info:
Anki 2.1.39 (576f0043) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2021-02-20 20:35:02

Caught exception:
Traceback (most recent call last):
File “aqt\”, line 87, in _on_closures_pending
File “aqt\”, line 59, in
File “aqt\”, line 76, in wrapped_done
File “aqt\”, line 114, in on_future_done
File “aqt\”, line 892, in on_collection_sync_finished
File “aqt\”, line 673, in reset
File “aqt\”, line 635, in moveToState
File “aqt\”, line 657, in _reviewState
File “aqt\”, line 72, in show
File “aqt\”, line 117, in nextCard
File “anki\”, line 85, in getCard
File “anki\”, line 139, in _getCard
File “anki\”, line 880, in _getRevCard
File “”, line 2, in _fillRev
File “anki\”, line 89, in decorator_wrapper
File “anki\”, line 86, in repl
TypeError: fillRev() got multiple values for argument ‘_old’

Maybe force close Anki from Task Manager and start it again? The issue should go away if it was caused by an add-on.

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