Help please - I cannot import any books (pdf, epub or other)

Hello everyone. I love Caliber! I can’t live without Caliber. After updating to newest Caliber, I cannot import any books (pdf, epub or other). I miss Calibre! Please assist if you can. Downloaded and tried both versions of Calibre – 64bit and 32bit. Please see message below:



I have Windows10 with i7. I have never experienced problems with Calibre. Why now?

Thank you for your kind assistance!

calibre, version 3.40.1
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information


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Failed to add the book: 2555
C:\Users\healt\Downloads\the-works-of-edgar-allan-poe-078-the-raven.pdf
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 1557, in create_book_entry
File "site-packages\calibre\db\backend.py", line 845, in execute
File "c:\t\t\apsw-mc0now\apsw-3.27.2-r1\src\cursor.c", line 236, in resetcursor
CantOpenError: CantOpenError: unable to open database file