[qprfan99]

I can't seem to be able to add any books. I've tried adding a few at a time & then just one by itself.
I got this Error Message:

calibre, version 3.42.0
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information
----------------------------------------------------------------------
Failed to add the book: 30-Second Architecture: The 50 Most Significant Principles and Styles in Architecture, Each Explained in Half a Minute
H:\Kindle Non Fiction\30secart.sanet.st.epub
With error:
Traceback (most recent call last):
File "site-packages\calibre\gui2\add.py", line 415, in add_book
File "site-packages\calibre\db\legacy.py", line 226, 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 1575, in create_book_entry
File "site-packages\calibre\db\backend.py", line 882, in execute
File "c:\t\t\apsw-zu_bhl\apsw-3.27.2-r1\src\cursor.c", line 236, in resetcursor
IOError: IOError: disk I/O error


Any help would be very welcome as I have a lot to add.
Larry