I had this error since upgrading to Calibre 8.12:
Failed to modify ePubs: Failed: Modify ePubs version (1, 8, 6)
The error seems to come from:
ImportError: cannot import name 'RECOVER_PARSER' from 'calibre.ebooks.oeb.parse_utils' (C:\Program Files\Calibre2\app\bin\python-lib.bypy.frozen\calibre\ebooks\oeb\parse_utils.pyc )
I tried both jointly and separately to replace a cover and update metadata. This occurs if I try a single book or a group.
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