Error message

PDOException: SQLSTATE[53100]: Disk full: 7 ERROR: could not access status of transaction 0 DETAIL: Could not write to file "pg_subtrans/0088" at offset 237568: No space left on device.: UPDATE queue SET expire=:db_update_placeholder_0 WHERE (item_id = :db_condition_placeholder_0) AND (expire = :db_condition_placeholder_1) ; Array ( [target] => default [return] => 2 [already_prepared] => 1 ) in SystemQueue->claimItem() (line 249 of /opt/drupal/modules/system/system.queue.inc).