calibre 4.8 ERRORS WHILE ADDING

[BAG777]

Hello all ...

I have been using Calibre for quite some time but am now experiencing problems when attempting to add any book. I frequently receive the error message below. Sometimes by restarting my computer I can add book(s) but lately even that has failed to work.

PLS HELP!

Thanks!

calibre, version 4.8.0
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information[/B]


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Failed to add the book: The First Men in the Moon
C:\Users\Bruce\AppData\Local\Temp\calibre_7hrejr\d uu9e0_add_books\0\B01C54MIMG_EBOK.azw3
With error:
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 1590, in create_book_entry
File "site-packages\calibre\db\cache.py", line 1310, in set_metadata
File "site-packages\calibre\db\cache.py", line 1136, in update_path
File "site-packages\calibre\db\backend.py", line 1606, in update_path
File "site-packages\calibre\db\tables.py", line 137, in set_path
File "site-packages\calibre\db\backend.py", line 874, in execute
File "c:\t\t\apsw-nhrdandw\src\cursor.c", line 236, in resetcursor
CantOpenError: CantOpenError: unable to open database file


----------------------------------------------------------------------
Failed to add the book: The Complete Short Stories
C:\Users\Bruce\AppData\Local\Temp\calibre_7hrejr\d uu9e0_add_books\1\B00NG5PHI6_EBOK.azw3
With error:
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-nhrdandw\src\cursor.c", line 236, in resetcursor
CantOpenError: CantOpenError: unable to open database file

[BetterRed]

See Kovid Goyal's response in this very recent thread ==>> calibre 4.6 to 4.8 error with files

BR