Fatal error: Uncaught Error: Class "Contao\CoreBundle\Migration\AbstractMigration" not found in /home/exklusivbeautysa/public_html/vendor/contao/core-bundle/src/Migration/Version406/Version460Update.php:23 Stack trace: #0 {main} thrown in /home/exklusivbeautysa/public_html/vendor/contao/core-bundle/src/Migration/Version406/Version460Update.php on line 23