Troubleshooting Error Communicating with Device? help!

[angelazwy]

Calibre fails to get the book list from kindle and shows the info."Error Communicating with Device", detail info.
"calibre, version 0.8.14
ERROR: Error: Error communicating with device

[Errno 22] invalid mode ('wb') or filename: u'M:\\metadata.calibre'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 81, in run
File "site-packages\calibre\gui2\device.py", line 332, in _books
File "site-packages\calibre\devices\kindle\driver.py", line 202, in books
File "site-packages\calibre\devices\usbms\driver.py", line 242, in books
File "site-packages\calibre\devices\usbms\driver.py", line 383, in sync_booklists
File "site-packages\calibre\devices\usbms\driver.py", line 381, in write_prefix
IOError: [Errno 22] invalid mode ('wb') or filename: u'M:\\metadata.calibre'
"