So I figured I would just have to add all the books again. So I tested one book and got the following error:
calibre, version 2.51.0
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information
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Failed to add the book: It Doesn't Take a Hero
D:\Norman Schwarzkopf\It Doesn't Take a Hero (15)\metadata.opf
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 369, in add_book
File "site-packages\calibre\db\legacy.py", line 214, 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 1519, in create_book_entry
File "site-packages\calibre\db\cache.py", line 1248, in set_metadata
File "site-packages\calibre\db\cache.py", line 1075, in update_path
File "site-packages\calibre\db\backend.py", line 1530, in update_path
File "site-packages\calibre\db\tables.py", line 130, in set_path
File "site-packages\calibre\db\backend.py", line 808, in execute
File "c:\cygwin64\home\kovid\sw\build\apsw-3.8.2-r1\src\cursor.c", line 231, in resetcursor
CantOpenError: CantOpenError: unable to open database file
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