[aEz2g61_nTlTrB4ZjRUxeQAAAAg] /wiki/index.php/Especial:ManageMessageGroups MWException: $wgCacheDirectory must be configured

Backtrace:

from /usr/www/pumpkins/public/wiki/extensions/Translate/TranslateUtils.php(388)
#0 /usr/www/pumpkins/public/wiki/extensions/Translate/utils/MessageChangeStorage.php(53): TranslateUtils::cacheFile()
#1 /usr/www/pumpkins/public/wiki/extensions/Translate/src/Synchronization/ManageGroupsSpecialPage.php(106): MessageChangeStorage::getCdbPath()
#2 /usr/www/pumpkins/public/wiki/includes/specialpage/SpecialPage.php(671): MediaWiki\Extension\Translate\Synchronization\ManageGroupsSpecialPage->execute()
#3 /usr/www/pumpkins/public/wiki/includes/specialpage/SpecialPageFactory.php(1378): SpecialPage->run()
#4 /usr/www/pumpkins/public/wiki/includes/MediaWiki.php(315): MediaWiki\SpecialPage\SpecialPageFactory->executePath()
#5 /usr/www/pumpkins/public/wiki/includes/MediaWiki.php(912): MediaWiki->performRequest()
#6 /usr/www/pumpkins/public/wiki/includes/MediaWiki.php(563): MediaWiki->main()
#7 /usr/www/pumpkins/public/wiki/index.php(53): MediaWiki->run()
#8 /usr/www/pumpkins/public/wiki/index.php(46): wfIndexMain()
#9 {main}