MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT pr_page,page_namespace,page_title,pr_expiry,pr_type,pr_level FROM `wiki_detemplatelinks`,`wiki_depage_restrictions`,`wiki_depage` WHERE tl_namespace = '1' AND tl_title = 'Weekly_Shōnen_Jump' AND (tl_from=pr_page) AND pr_cascade = '1' AND (page_id=pr_page)
Function: Title::getCascadeProtectionSources
Error: 1033 Incorrect information in file: './usr_web4_1/wiki_detemplatelinks.frm' (localhost)
' in /var/www/web4/html/includes/db/Database.php:636
Stack trace:
#0 /var/www/web4/html/includes/db/Database.php(591): Database->reportQueryError('Incorrect infor...', 1033, 'SELECT pr_page...', 'Title::getCasca...', false)
#1 /var/www/web4/html/includes/db/Database.php(1001): Database->query('SELECT pr_page...', 'Title::getCasca...')
#2 /var/www/web4/html/includes/Title.php(1645): Database->select(Array, Array, Array, 'Title::getCasca...')
#3 /var/www/web4/html/includes/Title.php(1158): Title->getCascadeProtectionSources()
#4 /var/www/web4/html/includes/Title.php(1016): Title->getUserPermissionsErrorsInternal('edit', Object(User), true)
#5 /var/www/web4/html/includes/EditPage.php(480): Title->getUserPermissionsErrors('edit', Object(User))
#6 /var/www/web4/html/includes/EditPage.php(389): EditPage->getEditPermissionErrors()
#7 /var/www/web4/html/includes/EditPage.php(346): EditPage->edit()
#8 /var/www/web4/html/includes/Wiki.php(505): EditPage->submit()
#9 /var/www/web4/html/includes/Wiki.php(63): MediaWiki->performAction(Object(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#10 /var/www/web4/html/wiki(114): MediaWiki->initialize(Object(Title), Object(Article), Object(OutputPage), Object(User), Object(WebRequest))
#11 {main}

Exception caught inside exception handler: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT value,exptime FROM `wiki_deobjectcache` WHERE keyname='usr_web4_1-wiki_de:messages:de'
Function: MediaWikiBagOStuff::_doquery
Error: 1033 Incorrect information in file: './usr_web4_1/wiki_deobjectcache.frm' (localhost)
' in /var/www/web4/html/includes/db/Database.php:636
Stack trace:
#0 /var/www/web4/html/includes/db/Database.php(591): Database->reportQueryError('Incorrect infor...', 1033, 'SELECT value,ex...', 'MediaWikiBagOSt...', false)
#1 /var/www/web4/html/includes/BagOStuff.php(454): Database->query('SELECT value,ex...', 'MediaWikiBagOSt...')
#2 /var/www/web4/html/includes/BagOStuff.php(324): MediaWikiBagOStuff->_doquery('SELECT value,ex...')
#3 /var/www/web4/html/includes/BagOStuff.php(240): SqlBagOStuff->_query('SELECT value,ex...', 'usr_web4_1-wiki...')
#4 /var/www/web4/html/includes/MessageCache.php(245): SqlBagOStuff->get('usr_web4_1-wiki...')
#5 /var/www/web4/html/includes/MessageCache.php(589): MessageCache->load('de')
#6 /var/www/web4/html/includes/MessageCache.php(526): MessageCache->getMsgFromNamespace('Databaseerror', 'de')
#7 /var/www/web4/html/includes/GlobalFunctions.php(583): MessageCache->get('databaseerror', true, false)
#8 /var/www/web4/html/includes/GlobalFunctions.php(548): wfMsgGetKey('databaseerror', true, false, true)
#9 /var/www/web4/html/includes/Exception.php(70): wfMsgReal('databaseerror', Array)
#10 /var/www/web4/html/includes/db/Database.php(2617): MWException->msg('databaseerror', 'Database error')
#11 /var/www/web4/html/includes/Exception.php(148): DBQueryError->getPageTitle()
#12 /var/www/web4/html/includes/Exception.php(183): MWException->reportHTML()
#13 /var/www/web4/html/includes/Exception.php(269): MWException->report()
#14 /var/www/web4/html/includes/Exception.php(327): wfReportException(Object(DBQueryError))
#15 [internal function]: wfExceptionHandler(Object(DBQueryError))
#16 {main}