I restarted with Crtl + Shift + R and then clicked on the pugin "customize plugin" and got this:
calibre, version 6.7.0
Fehlerdiagnosemodus: <p>Sie haben Calibre im Fehlerdiagnosemodus gestartet. Beim Verlassen des Programms wird ein Fehlerdiagnoseprotokoll erstellt: C:\Users\MS\AppData\Local\Temp\tmphqp7ghc9.txt<p>D as Protokoll wird automatisch angezeigt.
calibre, version 6.7.0
FEHLER: Unbehandelter Ausnahmefehler: <b>TypeError</b>:Invalide Column metadata.
calibre 6.7 embedded-python: True
Windows-10-10.0.19044-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.19044')
Python 3.10.1
Windows: ('10', '10.0.19044', 'SP0', 'Multiprocessor Free')
Interface language: de
Successfully initialized third party plugins: Gather KFX-ZIP (from KFX Input) (1, 49, 0) && Package KFX (from KFX Input) (1, 49, 0) && Action Chains (1, 17, 5) && Author Book Count (2, 2, 2) && BOL_DE (0, 9, 2) && Category Tags (0, 2, 7) && Clean Comments (0, 2, 1) && Clean Metadata (0, 0, 6) && Clipboard Search (1, 3, 2) && Count Pages (1, 11, 3) && EpubMerge (2, 15, 0) && EpubSplit (3, 5, 0) && Favourites Menu (1, 2, 0) && Find Duplicates (1, 9, 7) && Goodreads (1, 7, 0) && Goodreads Sync (1, 15, 6) && Goodreads_Rating (4, 0, 0) && Job Spy (1, 0, 192) && KFX metadata reader (from KFX Input) (1, 49, 0) && KFX Input (1, 49, 0) && Kindle Collections (1, 7, 29) && Manage Series (1, 4, 0) && Mass Search-Replace (1, 6, 0) && Modify ePub (1, 7, 3) && MultiColumnSearch (1, 0, 89) && Quality Check (1, 12, 0) && QuarantineAndScrub (3, 6, 119) && Quick Preferences (1, 6, 1) && Reading List (1, 14, 0) && Search The Internet (1, 8, 1) && Similar Stories (1, 0, 58) && User Category (1, 5, 6) && View Manager (1, 9, 0)
Traceback (most recent call last):
File "calibre_plugins.mass_search_replace.action", line 203, in show_configuration
File "calibre\customize\__init__.py", line 166, in do_user_config
File "calibre_plugins.mass_search_replace.__init__" , line 77, in config_widget
File "calibre_plugins.mass_search_replace.config", line 188, in __init__
File "calibre_plugins.mass_search_replace.config", line 416, in __init__
File "calibre_plugins.mass_search_replace.config", line 429, in populate_table
File "calibre_plugins.mass_search_replace.config", line 442, in populate_table_row
File "calibre_plugins.mass_search_replace.config", line 485, in set_editable_cells_in_row
File "calibre_plugins.mass_search_replace.config", line 682, in __init__
File "calibre_plugins.mass_search_replace.config", line 687, in setMenu
File "calibre_plugins.mass_search_replace.config", line 713, in hasError
File "calibre_plugins.mass_search_replace.SearchReplace ", line 124, in operation_testGetError
File "calibre_plugins.mass_search_replace.columns_metad ata", line 333, in get_possible_fields
File "calibre_plugins.mass_search_replace.columns_metad ata", line 87, in get_columns_where
File "calibre_plugins.mass_search_replace.columns_metad ata", line 75, in get_columns_from_dict
File "calibre_plugins.mass_search_replace.columns_metad ata", line 75, in <listcomp>
File "calibre_plugins.mass_search_replace.columns_metad ata", line 512, in __init__
TypeError: Invalide Column metadata.