Legacy Anki Fanfare GamificationFeedback⁩ add on does not work

I just installed the Legacy Anki Fanfare Gamification Feedback add on on my anki deck, and this error message come up everytime I try to open a deck. I updated to the most recent ANKI 2.1 version before installing this add on. Please help!

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 2.1.35 (84dcaa86) Python 3.8.0 Qt 5.14.2 PyQt 5.14.2
Platform: Mac 10.14.6
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2020-10-19 20:34:20
Add-ons possibly involved: ⁨Legacy Anki Fanfare GamificationFeedback⁩

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 660, in moveToState
File “aqt/gui_hooks.py”, line 2630, in call
File “anki/hooks.py”, line 583, in runHook
File “/Users/tiz_01/Library/Application Support/Anki2/addons21/2073603704/fanfare.py”, line 85, in onBeforeStateChange
AttributeError: ‘Fanfare’ object has no attribute ‘fb’