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The pdf file was just an example, unfortunately. I get the same error with epub, mobi, azw3 - any format and any book I've tried.
calibre, version 1.20.0
WARNING: Failed to read metadata: Failed to read metadata from the following:
Under My Skin - Doris Lessing.epub
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 136, in start
File "site-packages\calibre\gui2\add.py", line 225, in add
File "site-packages\calibre\db\legacy.py", line 211, in create_book_entry
File "site-packages\calibre\db\cache.py", line 57, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1379, in create_book_entry
File "site-packages\calibre\db\cache.py", line 1153, in set_metadata
File "site-packages\calibre\db\cache.py", line 1140, in set_field
File "site-packages\calibre\db\cache.py", line 961, in set_field
File "site-packages\calibre\db\write.py", line 513, in set_books
File "site-packages\calibre\db\write.py", line 437, in many_many
File "site-packages\calibre\db\backend.py", line 291, in executemany
File "c:\cygwin\home\kovid\sw\build\apsw-3.7.17-r1\src\cursor.c", line 231, in resetcursor
ConstraintError: ConstraintError: Foreign key violation: authors is still referenced
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