[Dfaure]

Just installed, defined a new custom column and tried to configure the plugin. Then:

calibre, version 8.12.0
ERROR: Unhandled exception: <b>TypeError</b>:Invalide Column metadata.

calibre 8.12 Portable embedded-python: True
Windows-10-10.0.26200-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.26200')
Python 3.11.13
Windows: ('10', '10.0.26200', 'SP0', 'Multiprocessor Free')
Interface language: None
EXE path: E:\Calibre Portable\Calibre\calibre.exe
Successfully initialized third party plugins: DeACSM (0, 0, 16) && DeDRM (10, 0, 9) && Action Chains (1, 20, 10) && Annotations (1, 17, 13) && Babelio_db (0, 8, 8) && Clean Metadata (0, 0, 7) && Comments Cleaner (1, 17, 1) && Count Pages (1, 13, 7) && Diaps Editing Toolbag (0, 5, 0) && Editor Chains (1, 1, 9) && Embed Comic Metadata (1, 6, 7) && EpubMerge (3, 2, 0) && EpubSplit (3, 12, 0) && Generate Cover (2, 3, 6) && KOReader Sync (0, 7, 2) && Kobo Metadata (1, 12, 0) && Kobo Utilities (2, 24, 3) && Manage Series (1, 5, 2) && Modify ePub (1, 8, 6) && Obok DeDRM (10, 0, 9) && Open With (1, 8, 4) && PersonnaLiseur (2, 1, 2) && Quality Check (1, 14, 2) && Reading List (1, 15, 6) && Reformat plugin (2, 4, 0) && ScrambleEbook (0, 6, 0) && Search The Internet (1, 11, 3) && SmartEject (2, 6, 0) && Sort_CSS (0, 1) && Typex (2, 0, 1) && Unplugged (1, 0, 0) && ePub Extended Metadata {Reader} (0, 11, 5) && ePub Extended Metadata {Writer} (0, 11, 5) && ePub Extended Metadata (0, 11, 5) && noosfere DB (1, 2, 0)
Traceback (most recent call last):
  File "calibre_plugins.epub_extended_metadata.action", line 86, in show_configuration
  File "calibre\customize\__init__.py", line 172, in do_user_config
  File "calibre_plugins.epub_extended_metadata.__init__", line 134, in config_widget
  File "calibre_plugins.epub_extended_metadata.config", line 239, in __init__
  File "calibre_plugins.epub_extended_metadata.config", line 413, in __init__
  File "calibre_plugins.epub_extended_metadata.config", line 424, in populate_table
  File "calibre_plugins.epub_extended_metadata.config", line 158, in get_names
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 601, in get_names
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 583, in _get_columns_type
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 806, in get_columns_where
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 800, in get_columns_from_dict
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 800, in <listcomp>
  File "calibre_plugins.epub_extended_metadata.common_utils.columns", line 210, in __init__
TypeError: Invalide Column metadata.