[Killerby]

Hello.

I get this message starting Calibre..
What is the solution to solve this, anybody?
I have the Dutch version also de portable version has the same error.
Already tried to rebuild the database no difference
not able to insert/add ne books.

With Regards Dick
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calibre, version 4.9.1
FOUT: Opstartfout: Er is een fout opgetreden bij het starten van calibre. delen van calibre functioneren mogelijk niet. Klik "Toon details" voor meer informatie.

Traceback (most recent call last):
File "site-packages\calibre\gui2\main.py", line 292, in initialize_db_stage2
File "site-packages\calibre\gui2\main.py", line 236, in start_gui
File "site-packages\calibre\gui2\ui.py", line 434, in initialize
File "site-packages\calibre\gui2\init.py", line 781, in save_layout_state
File "site-packages\calibre\gui2\library\views.py", line 636, in save_state
File "site-packages\calibre\gui2\library\views.py", line 630, in write_state
File "site-packages\calibre\db\cache.py", line 62, in call_func_with_lock
File "site-packages\calibre\db\cache.py", line 616, in set_pref
File "site-packages\calibre\db\backend.py", line 134, in set
File "site-packages\calibre\db\backend.py", line 130, in __setitem__
File "site-packages\calibre\db\backend.py", line 874, in execute
File "c:\t\t\apsw-r08j4l0g\src\cursor.c", line 236, in resetcursor
CantOpenError: CantOpenError: unable to open database file