Fatal error: Uncaught Error: Interface "OCP\Migration\ISchemaMigration" not found in /usr/local/www/owncloud/apps/activity/appinfo/Migrations/Version20181019151118.php:34 Stack trace: #0 {main} thrown in /usr/local/www/owncloud/apps/activity/appinfo/Migrations/Version20181019151118.php on line 34