Google Doc extractor error

[#1]

Hi Team

My Google Doc extractor is throwing this error in log file..pls help me out

2015-08-31 14:30:17: Logging into Google Drive ....

2015-08-31 14:30:17: Login successful.

2015-08-31 14:30:17: Begin reading Google Drive for 'Extrusion CPU' ...

2015-08-31 14:30:18: ERROR: retrieving file: Web request to 'https://accounts.google.com/o/oauth2/token' failed.

2015-08-31 14:30:18: End reading Google Drive.

2015-08-31 14:30:18: Begin sorting result ...

2015-08-31 14:30:18: ERROR: Sorting results Object reference not set to an instance of an object.

2015-08-31 14:30:18: End sorting result.