Fatal error: Declaration of craft\helpers\FileHelper::getExtensionByMimeType($mimeType): string must be compatible with yii\helpers\BaseFileHelper::getExtensionByMimeType($mimeType, $preferShort = false, $magicFile = null) in /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/craftcms/cms/src/helpers/FileHelper.php on line 719
Stack trace: #0 /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/composer/ClassLoader.php(571): include() #1 /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile() #2 /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/craftcms/cms/lib/yii2/Yii.php(36): Composer\Autoload\ClassLoader->loadClass() #3 /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/craftcms/cms/bootstrap/bootstrap.php(202): Yii::setAlias() #4 /homepages/28/d4295007561/htdocs/adalbertstrasse/vendor/craftcms/cms/bootstrap/web.php(51): require('/homepages/28/d...') #5 /homepages/28/d4295007561/htdocs/adalbertstrasse/web/index.php(20): require('/homepages/28/d...') #6 {main}