[OhIDont]

Ever since I downloaded the the 4th version of Calibre, it gives me error every time, "it's impossible to add the book"! So I tried downloading the 3rd version instead, and it's the same.
The error it gives me is:

calibre, version 3.48.0
----------------------------------------------------------------------
Impossibile aggiungere il libro:the WAR of ART - by Steven Pressfield [scanned book].pdf
C:\Users\picon\Downloads\Steven Pressfield - The War of Art_ Break Through the Blocks and Win Your Inner Creative Battles-Warner Books (2002).pdf
Con errore:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 414, in add_book
File "site-packages\calibre\db\legacy.py", line 225, in create_book_entry
File "site-packages\calibre\db\cache.py", line 62, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1580, in create_book_entry
File "site-packages\calibre\db\backend.py", line 874, 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