Uncaught exception thrown in session handler.

PDOException: SQLSTATE[42000]: [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]The database 'stsconsumerdb_2' has reached its size quota. Partition or delete data, drop indexes, or consult the documentation for possible resolutions. in _drupal_session_write() (line 209 of C:\home\site\wwwroot\includes\session.inc).