Fatal error: Declaration of craft\helpers\FileHelper::getExtensionByMimeType($mimeType): string must be compatible with yii\helpers\BaseFileHelper::getExtensionByMimeType($mimeType, $preferShort = false, $magicFile = null) in /www/htdocs/w017b7d7/klimaaktionswoche.org/vendor/craftcms/cms/src/helpers/FileHelper.php on line 719