Fatal error: Uncaught Error: Interface "App\Contracts\Extension\UpgradeStepInterface" not found in C:\xampp\htdocs\gnu_7\g7\upgrades\Upgrade_7_0_0_alpha_15.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\gnu_7\g7\upgrades\Upgrade_7_0_0_alpha_15.php on line 18