Internal error

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[84da02d3f68e0c8294114a84] /wiki/index.php?title=Special:ManageMessageGroups MWException: $wgCacheDirectory must be configured

Backtrace:

from /var/www/html/wiki/extensions/Translate/TranslateUtils.php(387)
#0 /var/www/html/wiki/extensions/Translate/utils/MessageChangeStorage.php(53): TranslateUtils::cacheFile()
#1 /var/www/html/wiki/extensions/Translate/specials/SpecialManageGroups.php(81): MessageChangeStorage::getCdbPath()
#2 /var/www/html/wiki/includes/specialpage/SpecialPage.php(646): SpecialManageGroups->execute()
#3 /var/www/html/wiki/includes/specialpage/SpecialPageFactory.php(1386): SpecialPage->run()
#4 /var/www/html/wiki/includes/MediaWiki.php(309): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#5 /var/www/html/wiki/includes/MediaWiki.php(913): MediaWiki->performRequest()
#6 /var/www/html/wiki/includes/MediaWiki.php(546): MediaWiki->main()
#7 /var/www/html/wiki/index.php(53): MediaWiki->run()
#8 /var/www/html/wiki/index.php(46): wfIndexMain()
#9 {main}