I can't use Custom study for any of my card decks :'(

when i try to do custom study for my cards I get this error

Error
An error occurred. Please use Tools > Check Database to see if that fixes the problem.
If problems persist, please report the problem on our support site. Please copy and paste the information below into your report.
Anki 2.1.42 (8eebfe18) Python 3.8.6 Qt 5.14.2 PyQt 5.14.2
Platform: Windows 10
Flags: frz=True ao=False sv=2
Add-ons, last update check: 2025-02-22 14:02:31

Caught exception:
Traceback (most recent call last):
File “aqt\customstudy.py”, line 40, in
File “aqt\customstudy.py”, line 65, in onRadioChange
AttributeError: ‘Scheduler’ object has no attribute ‘totalNewForCurrentDeck’

I have disabled all add ons and have tried tools > check database and it still does not solve the issue.

Please help, thank you.

Are you using Anki 2.1.42?
This version is very old. Any reason for not upgrading?

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