Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Utility\ExtensionManagementUtility" not found in /var/www/html/cwtypo3/packages/wv_site/Configuration/TCA/Overrides/tt_content.php:21 Stack trace: #0 /var/www/html/cwtypo3/packages/wv_site/Configuration/TCA/Overrides/tt_content.php(120): {closure}() #1 {main} thrown in /var/www/html/cwtypo3/packages/wv_site/Configuration/TCA/Overrides/tt_content.php on line 21