[spynumber]

When ever I try to add books I get errors. Any ideas what I need to do to fix it? I have copied the log file below:

calibre, version 2.79.1
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information


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Failed to add the book: Forgive My Grief Vol I - IV
D:\Books\Forgive My Grief\Forgive_My_Grief_01.mobi
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 379, in add_book
File "site-packages\calibre\db\legacy.py", line 217, in create_book_entry
File "site-packages\calibre\db\cache.py", line 61, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1530, in create_book_entry
File "site-packages\calibre\db\backend.py", line 822, 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


----------------------------------------------------------------------
Failed to add the book: Forgive My Grief Vol I - IV
D:\Books\Forgive My Grief\Forgive_My_Grief_04.mobi
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 379, in add_book
File "site-packages\calibre\db\legacy.py", line 217, in create_book_entry
File "site-packages\calibre\db\cache.py", line 61, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1530, in create_book_entry
File "site-packages\calibre\db\backend.py", line 822, 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


----------------------------------------------------------------------
Failed to add the book: Forgive My Grief Vol I - IV
D:\Books\Forgive My Grief\Forgive_My_Grief_02.mobi
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 379, in add_book
File "site-packages\calibre\db\legacy.py", line 217, in create_book_entry
File "site-packages\calibre\db\cache.py", line 61, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1530, in create_book_entry
File "site-packages\calibre\db\backend.py", line 822, 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


----------------------------------------------------------------------
Failed to add the book: Forgive My Grief Vol I - IV
D:\Books\Forgive My Grief\Forgive_My_Grief_03.mobi
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 379, in add_book
File "site-packages\calibre\db\legacy.py", line 217, in create_book_entry
File "site-packages\calibre\db\cache.py", line 61, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 1530, in create_book_entry
File "site-packages\calibre\db\backend.py", line 822, 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