MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT * FROM `job` WHERE job_id >= 0 ORDER BY job_id LIMIT 1
Function: Job::pop
Error: 1146 Table 'wikidb.job' doesn't exist (localhost)
' in /usr/share/mediawiki/includes/Database.php:844
Stack trace:
#0 /usr/share/mediawiki/includes/Database.php(799): Database->reportQueryError('Table 'wikidb.j...', 1146, ' SELECT * FRO...', 'Job::pop', false)
#1 /usr/share/mediawiki/includes/Database.php(1244): Database->query(' SELECT * FRO...', 'Job::pop')
#2 /usr/share/mediawiki/includes/Database.php(1263): Database->select('job', '*', 'job_id >= 0', 'Job::pop', Array)
#3 /usr/share/mediawiki/includes/JobQueue.php(98): Database->selectRow('job', '*', 'job_id >= 0', 'Job::pop', Array)
#4 /usr/share/mediawiki/includes/Wiki.php(346): Job::pop()
#5 /usr/share/mediawiki/includes/Wiki.php(294): MediaWiki->doJobs()
#6 /usr/share/mediawiki/index.php(91): MediaWiki->finalCleanup(Array, Object(LoadBalancer), Object(OutputPage))
#7 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Table 'wikidb.page' doesn't exist (localhost)' in /usr/share/mediawiki/includes/Database.php:973
Stack trace:
#0 /usr/share/mediawiki/includes/MessageCache.php(307): Database->fetchObject(false)
#1 /usr/share/mediawiki/includes/MessageCache.php(244): MessageCache->loadFromDB()
#2 /usr/share/mediawiki/includes/MessageCache.php(434): MessageCache->load()
#3 /usr/share/mediawiki/includes/GlobalFunctions.php(427): MessageCache->get('databaseerror', true, false)
#4 /usr/share/mediawiki/includes/GlobalFunctions.php(396): wfMsgGetKey('databaseerror', true, false, true)
#5 /usr/share/mediawiki/includes/Exception.php(43): wfMsgReal('databaseerror', Array)
#6 /usr/share/mediawiki/includes/Database.php(292): MWException->msg('databaseerror', 'Database error')
#7 /usr/share/mediawiki/includes/Exception.php(148): DBQueryError->getPageTitle()
#8 /usr/share/mediawiki/includes/Exception.php(116): MWException->htmlHeader()
#9 /usr/share/mediawiki/includes/Exception.php(134): MWException->reportHTML()
#10 /usr/share/mediawiki/includes/Exception.php(213): MWException->report()
#11 /usr/share/mediawiki/includes/Exception.php(256): wfReportException(Object(DBQueryError))
#12 [internal function]: wfExceptionHandler(Object(DBQueryError))
#13 {main}