MediaWiki internal error.

Original exception: exception 'DBQueryError' with message 'A database error has occurred
Query: SELECT * FROM `wiki_jpinterwiki` WHERE iw_prefix = '%e7%89%b9%e5%88%a5'
Function: Interwiki::load
Error: 1033 Incorrect information in file: './usr_web4_1/wiki_jpinterwiki.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 * FROM...', 'Interwiki::load', false)
#1 /var/www/web4/html/includes/db/Database.php(1001): Database->query('SELECT * FROM...', 'Interwiki::load')
#2 /var/www/web4/html/includes/Interwiki.php(156): Database->select('interwiki', '*', Array, 'Interwiki::load')
#3 /var/www/web4/html/includes/Interwiki.php(58): Interwiki::load('%e7%89%b9%e5%88...')
#4 /var/www/web4/html/includes/Interwiki.php(35): Interwiki::fetch('%E7%89%B9%E5%88...')
#5 /var/www/web4/html/includes/Title.php(2075): Interwiki::isValidInterwiki('%E7%89%B9%E5%88...')
#6 /var/www/web4/html/includes/Title.php(171): Title->secureAndSplit()
#7 /var/www/web4/html/includes/Wiki.php(112): Title::newFromURL('%E7%89%B9%E5%88...')
#8 /var/www/web4/html/wiki(58): MediaWiki->checkInitialQueries('%E7%89%B9%E5%88...', 'view')
#9 {main}

Exception caught inside exception handler: exception 'DBUnexpectedError' with message 'Error in fetchObject(): Incorrect information in file: './usr_web4_1/wiki_jppage.frm' (localhost)' in /var/www/web4/html/includes/db/Database.php:763
Stack trace:
#0 /var/www/web4/html/includes/MessageCache.php(340): Database->fetchObject(false)
#1 /var/www/web4/html/includes/MessageCache.php(268): MessageCache->loadFromDB('ja')
#2 /var/www/web4/html/includes/MessageCache.php(589): MessageCache->load('ja')
#3 /var/www/web4/html/includes/MessageCache.php(526): MessageCache->getMsgFromNamespace('Databaseerror', 'ja')
#4 /var/www/web4/html/includes/GlobalFunctions.php(583): MessageCache->get('databaseerror', true, false)
#5 /var/www/web4/html/includes/GlobalFunctions.php(548): wfMsgGetKey('databaseerror', true, false, true)
#6 /var/www/web4/html/includes/Exception.php(70): wfMsgReal('databaseerror', Array)
#7 /var/www/web4/html/includes/db/Database.php(2617): MWException->msg('databaseerror', 'Database error')
#8 /var/www/web4/html/includes/Exception.php(201): DBQueryError->getPageTitle()
#9 /var/www/web4/html/includes/Exception.php(164): MWException->htmlHeader()
#10 /var/www/web4/html/includes/Exception.php(183): MWException->reportHTML()
#11 /var/www/web4/html/includes/Exception.php(269): MWException->report()
#12 /var/www/web4/html/includes/Exception.php(327): wfReportException(Object(DBQueryError))
#13 [internal function]: wfExceptionHandler(Object(DBQueryError))
#14 {main}