Fatal error: Uncaught Error: Interface "OCP\Migration\ISchemaMigration" not found in /users/ms-it/www/oc/apps-external/richdocuments/appinfo/Migrations/Version20190623184232.php:10 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/apps-external/richdocuments/appinfo/Migrations/Version20190623184232.php on line 10