[lchora]

I have Calibre version 0.9.1 and Kobo Version 2.1.4. The first two or three times I plugged in my Kobo, everything worked well. However, now I'm getting the following error every time:

calibre, version 0.9.1
ERROR: Error: Error communicating with device

[Errno 22] Invalid argument

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 85, in run
File "site-packages\calibre\gui2\device.py", line 468, in _books
File "site-packages\calibre\devices\kobo\driver.py", line 1623, in books
File "site-packages\calibre\devices\kobo\driver.py", line 872, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 391, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 390, in write_prefix
File "site-packages\calibre\ebooks\metadata\book\json_codec.p y", line 122, in encode_to_file
IOError: [Errno 22] Invalid argument

Thoughts on what's going on? Any help would be much appreciated!