Discuz! info: MySQL Query Error

Time: 2018-7-17 12:31am
Script: /viewpro.php

SQL: SELECT * FROM cdb_crons WHERE available>'0' AND nextrun<='1531758670' LIMIT 1
Error: Table 'amsforum_forumdb.cdb_crons' doesn't exist
Errno.: 1146

Similar error report has beed dispatched to administrator before.