Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in /var/www/html/lib/pkp/classes/migration/upgrade/v3_4_0/FailedJobsMigration.php:21 Stack trace: #0 {main} thrown in /var/www/html/lib/pkp/classes/migration/upgrade/v3_4_0/FailedJobsMigration.php on line 21