Fatal error: Uncaught Error: Class 'Contao\CoreBundle\Migration\AbstractMigration' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Migration/Version405/Version450Update.php:22
Stack trace:
#0 {main}
thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Migration/Version405/Version450Update.php on line 22