python 2.7 - upload_video.py sample code -

i ran sample code describe on https://developers.google.com/youtube/v3/guides/uploading_a_video in ubuntu 14.04 , following error message:

traceback (most recent call last):     file "upload_video.py", line 178, in <module>         youtube = get_authenticated_service(args)     file "upload_video.py", line 82, in get_authenticated_service         credentials = storage.get()     file "/usr/local/lib/python2.7/dist-packages/oauth2client/client.py", line 389, in         return self.locked_get()     file "/usr/local/lib/python2.7/dist-packages/oauth2client/file.py", line 81, in locked_get         credentials = credentials.new_from_json(content)     file "/usr/local/lib/python2.7/dist-packages/oauth2client/client.py", line 294, in new_from_json         module_name = data['_module'] keyerror: '_module' 

is problem due missing packages or else?