Uncaught exception thrown in session handler.

PDOException: SQLSTATE[53100]: Disk full: 7 ERROR: could not access status of transaction 0 DETAIL: Could not write to file "pg_subtrans/0164" at offset 147456: No space left on device.: INSERT INTO sessions (sid, ssid, uid, cache, hostname, session, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6); Array ( ) in _drupal_session_write() (line 209 of C:\pathogate\includes\session.inc).