Fatal error: Uncaught Error: Class "craft\db\Migration" not found in /home/rosengar/www-craft/craft-rosengart/vendor/craftcms/ckeditor/src/migrations/BaseConvertMatrixContentMigration.php:23 Stack trace: #0 {main} thrown in /home/rosengar/www-craft/craft-rosengart/vendor/craftcms/ckeditor/src/migrations/BaseConvertMatrixContentMigration.php on line 23