Problem when I start anki

[ebanDev]

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• read the "before you install instructions" and disabled all the known conflicted add-ons.
• You've looked through previous issues to see if someone else had the same problem.

Describe the bug
A clear and concise description of what the bug is.

Screenshots
When I start anki I have this error message

Erreur
 Une erreur est survenue. Veuillez démarrer Anki en maintenant la touche majuscule enfoncée, ce qui désactivera temporairement les greffons que vous avez installés.  Si le problème ne survient que lorsque les greffons sont activés, veuillez utiliser le menu Outils > Greffons afin de désactiver certains greffons. Redémarrez Anki jusqu’à ce que vous découvriez le greffon qui cause le problème.  Une fois ce greffon découvert, merci de signaler le problème sur le site de support du greffon.  Information de débogage :
Anki 2.1.38 (355e4cd5) Python 3.8.1 Qt 5.15.1 PyQt 5.15.1
Platform: Linux
Flags: frz=True ao=True sv=1
Add-ons, last update check: 2021-01-02 21:21:12
Greffons possiblement impliqués : ⁨BeautifyAnki⁩

Traceback (most recent call last):
  File "aqt/main.py", line 503, in loadCollection
  File "aqt/main.py", line 635, in moveToState
  File "aqt/main.py", line 642, in _deckBrowserState
  File "aqt/deckbrowser.py", line 56, in show
  File "aqt/deckbrowser.py", line 113, in _renderPage
  File "aqt/deckbrowser.py", line 123, in __renderPage
  File "aqt/webview.py", line 446, in stdHtml
  File "aqt/hooks_gen.py", line 3184, in __call__
  File "/home/eban/.local/share/Anki2/addons21/BeautifyAnki/__init__.py", line 80, in on_webview_will_set_content
    web_content.css.remove("deckbrowser.css")
ValueError: list.remove(x): x not in list

Contex (please complete the following information):

• OS: [Fedora]
• Anki Version [e.g. 2.1.38]

Additional context
In your Anki
go to help > About > Copy Debug Log and paste it between the following backticks

    
    Anki 2.1.38 (355e4cd5) Python 3.8.1 Qt 5.15.1 PyQt 5.15.1
    Platform: Linux
    Flags: frz=True ao=True sv=1
    Add-ons, last update check: 2021-01-02 21:21:12
    
    
    ===Add-ons (active)===
    (add-on provided name [Add-on folder, installed at, version, is config changed])
    '' ['BeautifyAnki', 0, 'None', mod]
    
    ===IDs of active AnkiWeb add-ons===
    
    
    ===Add-ons (inactive)===
    (add-on provided name [Add-on folder, installed at, version, is config changed])
    Review Heatmap ['review_heatmap', 2020-04-30T15:23, 'None', '']
    The KING of Button Add-ons ['374005964', 2020-04-18T00:33, 'None', '']

[coco1602]

I have the same issue.

[superbat85]

I have the same issue, anyone have any idea what could be the problem?