Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in C:\xampp\htdocs\database\migrations\2018_02_14_000000_add_is_internal_to_groups_table.php:21 Stack trace: #0 {main} thrown in C:\xampp\htdocs\database\migrations\2018_02_14_000000_add_is_internal_to_groups_table.php on line 21