Me podeis ayudar con calibre - kobo?

calibre, version 2.12.0
ERROR: Error: Error en la comunicación con el dispositivo

database disk image is malformed

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 87, in run
File "site-packages\calibre\gui2\device.py", line 532, in _sync_booklists
File "calibre_plugins.kobotouch_extended.device.driver" , line 337, in sync_booklists
File "site-packages\calibre\devices\kobo\driver.py", line 923, in sync_booklists
File "site-packages\calibre\devices\kobo\driver.py", line 2297, in update_device_database_collections
File "site-packages\calibre\devices\kobo\driver.py", line 2494, in remove_book_from_device_bookshelves
DatabaseError: database disk image is malformed