Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in C:\xampp\htdocs\new_saas\backend\database\migrations\2026_03_12_160020_alter_campaigns_add_constraints.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\new_saas\backend\database\migrations\2026_03_12_160020_alter_campaigns_add_constraints.php on line 7