Fatal error: Uncaught Error: Class "Contao\CoreBundle\Migration\AbstractMigration" not found in /home/exklusivbeautysa/public_html/vendor/contao-bootstrap/grid/src/Migration/AutoGridWidthsMigration.php:19 Stack trace: #0 {main} thrown in /home/exklusivbeautysa/public_html/vendor/contao-bootstrap/grid/src/Migration/AutoGridWidthsMigration.php on line 19