[BerlinerKindl]

Thanks but after an

calibredb remove 1223-1237

I get this error:

Traceback (most recent call last):
  File "site.py", line 58, in main
  File "site-packages/calibre/library/cli.py", line 1192, in main
  File "site-packages/calibre/library/cli.py", line 361, in command_remove
ValueError: int() base must be >= 2 and <= 36