Fatal error: Uncaught Error: Class "App\Extension\AbstractUpgradeStep" not found in C:\xampp\htdocs\gnu_7\g7\upgrades\Upgrade_7_0_0_beta_7.php:27 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gnu_7\g7\upgrades\Upgrade_7_0_0_beta_7.php on line 27