Error: Remaining time for Anki 21

Hey, after the newest update my Anki desk doesn’t work anymore. I always get this error:

Anki 23.12.1 (1a1d4d54) (ao)
Python 3.9.15 Qt 6.5.3 PyQt 6.5.3
Platform: macOS-13.4.1-arm64-arm-64bit

Traceback (most recent call last):
File “aqt.webview”, line 50, in cmd
File “aqt.webview”, line 157, in _onCmd
File “aqt.webview”, line 680, in _onBridgeCmd
File “_aqt.hooks”, line 5415, in call
File “/Users/leoniemarie/Library/Application Support/Anki2/addons21/1508357010/utils/JSCallable.py”, line 29, in _onBridgeMessage
ret = func(*argList)
File “/Users/leoniemarie/Library/Application Support/Anki2/addons21/1508357010/jsapi/remainingCardCount.py”, line 10, in getCurrentRemainingCardCount
if reviewer.hadCardQueue:
AttributeError: ‘Reviewer’ object has no attribute ‘hadCardQueue’

===Add-ons (active)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
AMBOSS add-on [‘0amboss_addon’, 2023-10-17T23:29, ‘None’, ‘’]
Image Occlusion Enhanced [‘1374772155’, 2022-04-09T09:15, ‘None’, ‘’]
Remaining time for Anki 21 [‘1508357010’, 2020-12-13T15:14, ‘20.12.13i151’, ‘’]
The KING of Button Add-ons [‘374005964’, 2024-01-27T11:19, ‘None’, ‘’]

===IDs of active AnkiWeb add-ons===
1374772155 1508357010 374005964

===Add-ons (inactive)===
(add-on provided name [Add-on folder, installed at, version, is config changed])

I would be so thankful, if anybody could help me!

Have you checked your add-ons? It’s likely that at least one of them hasn’t been updated to be compatible with your updated Anki. Perhaps the one named in the error, which hasn’t been updated in 3 years?

Try #2 Troubleshooting - Anki Manual