Calibre + Kobo Error Msg

hi...just downloaded latest calibre upgrade but now can't get Kobo Touch to communicate with the app. Appreciate any help you can offer ...Get the following error msg -
calibre, version 0.8.47
ERROR: Error: Error communicating with device
'int' object has no attribute 'startswith'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 82, in run
File "site-packages\calibre\gui2\device.py", line 339, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 301, in books
AttributeError: 'int' object has no attribute 'startswith'