[amintarabay]

I got "Error Communicating With Device" using Calibre 2.1 on OSX 10.9.4. After I press ok on the warning popup calibre shows the device tab and the marvin tab but every time I try to send to device or update metadata I get the same "Error Communication With Device" warning that i get when first connecting.
the log is as follows:

calibre, version 2.1.0
ERROR: Error: Error communicating with device

database disk image is malformed

Traceback (most recent call last):
File "site-packages/calibre/gui2/device.py", line 86, in run
File "site-packages/calibre/gui2/device.py", line 501, in _books
File "/var/folders/jd/z5fd7qh13hsgxw4l1j8gvkk00000gn/T/calibre_2.1.0_tmp_jbwQtV/8VIwYJ_ios_local_db/Marvin_overlays.py", line 285, in books
File "/var/folders/jd/z5fd7qh13hsgxw4l1j8gvkk00000gn/T/calibre_2.1.0_tmp_jbwQtV/8VIwYJ_ios_local_db/Marvin_overlays.py", line 2352, in _restore_from_snapshot
File "/var/folders/jd/z5fd7qh13hsgxw4l1j8gvkk00000gn/T/calibre_2.1.0_tmp_jbwQtV/8VIwYJ_ios_local_db/Marvin_overlays.py", line 2328, in _validate_mainDb_profile
File "/var/folders/jd/z5fd7qh13hsgxw4l1j8gvkk00000gn/T/calibre_2.1.0_tmp_jbwQtV/8VIwYJ_ios_local_db/Marvin_overlays.py", line 1579, in _compare_mainDb_profiles
File "/var/folders/jd/z5fd7qh13hsgxw4l1j8gvkk00000gn/T/calibre_2.1.0_tmp_jbwQtV/8VIwYJ_ios_local_db/Marvin_overlays.py", line 2109, in _profile_db
DatabaseError: database disk image is malformed