Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Utility\ExtensionManagementUtility" not found in /var/www/html/cwtypo3/packages/wv_site/Configuration/TCA/Overrides/sys_template.php:7 Stack trace: #0 {main} thrown in /var/www/html/cwtypo3/packages/wv_site/Configuration/TCA/Overrides/sys_template.php on line 7