Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in C:\xampp\htdocs\database\migrations\2021_10_03_180121_add_indexes_to_tables.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\database\migrations\2021_10_03_180121_add_indexes_to_tables.php on line 21