Fatal error: Uncaught Error: Interface "OCP\Migration\ISchemaMigration" not found in /users/ms-it/www/oc/apps-external/richdocuments/appinfo/Migrations/Version20190310162809.php:30 Stack trace: #0 {main} thrown in /users/ms-it/www/oc/apps-external/richdocuments/appinfo/Migrations/Version20190310162809.php on line 30