[kentak]

I cannot transfer a file from Digital Editions to Calibre. I get the following error message:

calibre, version 4.11.1
ERROR: Errors while adding: Failed to add any books, click "Show details" for more information
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Failed to add the book: Amy and Isabelle
C:\Users\ken\AppData\Local\Temp\calibre_cxqkox\c6q hwb_add_books\0\Amy and Isabelle-1.epub
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 881, in execute
File "c:\t\t\apsw-cjr7a2yu\src\cursor.c", line 236, in resetcursor
IOError: IOError: disk I/O error

Can someone help me here?
Thank you in advance.
Kentak