[Dan__]

Does any know what might cause this error?
calibre, version 8.15.0
ERROR: Error: Error communicating with device

Could not kepubify the book Eva Rae Thomas Mystery Box Set (Eva Rae Thomas Mystery Box Set - Willow, Rose,_1980.epub) failed with error: Failed to find obfuscation key

Traceback (most recent call last):
File "calibre/devices/kobo/driver.py", line 2362, in _kepubify
File "calibre/ebooks/oeb/polish/kepubify.py", line 545, in kepubify_path
File "calibre/ebooks/oeb/polish/container.py", line 1635, in get_container
File "calibre/ebooks/oeb/polish/container.py", line 1232, in __init__
File "calibre/ebooks/oeb/polish/container.py", line 1359, in process_encryption
calibre.ebooks.oeb.polish.container.ObfuscationKey Missing: Failed to find obfuscation key

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "calibre/gui2/device.py", line 110, in run
File "calibre/gui2/device.py", line 661, in _upload_books
File "calibre/devices/kobo/driver.py", line 2304, in upload_books
File "calibre/devices/kobo/driver.py", line 2366, in _kepubify
ValueError: Could not kepubify the book Eva Rae Thomas Mystery Box Set (Eva Rae Thomas Mystery Box Set - Willow, Rose,_1980.epub) failed with error: Failed to find obfuscation key


Thanks