[randy@asa3.org]

Our small non-profit organization has five office computers, three of which have Calibre installations which we have been using successfully for several years to create epub and mobi editions of our quarterly journal. After upgrading all three to version 3.39.1, two of the computers work well but one computer, the one most often used, cannot reliably recognize a file with filetype epub. The other two computers can easily add epub files from our shared directory but when this computer adds the very same epub files from the same directory, a few are added (but are then not recongized or displayed as EPUB files!!) but then it gives an error when trying to add additional epub files. The error report is as follows below. I have tried uninstalling and reinstalling and repairing and checking all settings to be sure they are the same. What else can I do?

Randy

calibre, version 3.39.1
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information


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Failed to add the book: PSCF3-19p01-02Peterson
H:\JASA\m19\epub\PSCF3-19p01-02Peterson.epub
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 413, in add_book
File "site-packages\calibre\db\legacy.py", line 224, in create_book_entry
File "site-packages\calibre\db\cache.py", line 63, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1567, in create_book_entry
File "site-packages\calibre\db\cache.py", line 1287, in set_metadata
File "site-packages\calibre\db\cache.py", line 1113, in update_path
File "site-packages\calibre\db\backend.py", line 1574, in update_path
File "site-packages\calibre\db\tables.py", line 136, in set_path
File "site-packages\calibre\db\backend.py", line 845, in execute
File "c:\t\t\apsw-0ea1mm\apsw-3.26.0-r1\src\cursor.c", line 236, in resetcursor
CantOpenError: CantOpenError: unable to open database file