I just tried this for the first time in a very long time, this was the result
Spoiler:
calibre, version 7.15.0
ERROR: Unhandled exception: <b>KeyError</b>:'column_date_sidecar_modified'
calibre 7.15 embedded-python: True
Windows-10-10.0.19045-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19045')
Python 3.11.5
Windows: ('10', '10.0.19045', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: C:\Program Files\Calibre2\calibre.exe
Successfully initialized third party plugins: DeDRM (10, 0, 9) && Calibre Power Search Plugin (2, 2, 0) && Count Pages (1, 13, 6) && EpubMerge (3, 1, 0) && Find Duplicates (1, 10, 9) && KOReader Sync (0, 6, 6) && KePub Input (3, 6, 6) && KePub Output (3, 6, 11) && Kindle hi-res covers (0, 5, 1) && Kobo Books (1, 9, 2) && Kobo Utilities (2, 17, 1) && KoboTouchExtended (3, 6, 11) && MultiColumnSearch (1, 0, 96) && Obok DeDRM (10, 0, 9) && Reading List (1, 15, 4) && Save Composite Custom Columns (1, 1, 1) && View Manager (1, 10, 3)
Traceback (most recent call last):
File "calibre\utils\config.py", line 430, in __getitem__
KeyError: 'column_date_sidecar_modified'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "calibre_plugins.koreader.action", line 841, in sync_to_calibre
File "calibre_plugins.koreader.action", line 410, in update_metadata
File "calibre\utils\config.py", line 432, in __getitem__
KeyError: 'column_date_sidecar_modified'