Watch Plugin is Not Working

[moesaif]

sarah watch titanic
produce the following error
(process:24000): libpeas-WARNING **: Error importing plugin 'watch':
Traceback (most recent call last):
File "/usr/lib/python3.5/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 986, in _gcd_import
File "", line 969, in _find_and_load
File "", line 958, in _find_and_load_unlocked
File "", line 673, in _load_unlocked
File "", line 665, in exec_module
File "", line 222, in _call_with_frames_removed
File "./plugins/watch/watch.py", line 24, in
import omdb
ImportError: No module named 'omdb'

(process:24000): libpeas-WARNING **: Error loading plugin 'watch'

** (process:24000): CRITICAL **: sarah_iextension_activate: assertion 'self != NULL' failed