Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in /home/flighto/e-commerce2/packages/Webkul/Sales/src/Database/Migrations/2019_09_11_184511_create_refunds_table.php:7 Stack trace: #0 {main} thrown in /home/flighto/e-commerce2/packages/Webkul/Sales/src/Database/Migrations/2019_09_11_184511_create_refunds_table.php on line 7