Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in /var/www/html/packages/Webkul/Customer/src/Database/Migrations/2018_07_24_082635_create_customer_groups_table.php:7 Stack trace: #0 {main} thrown in /var/www/html/packages/Webkul/Customer/src/Database/Migrations/2018_07_24_082635_create_customer_groups_table.php on line 7