Fatal error: Uncaught Error: Class "Illuminate\Database\Migrations\Migration" not found in D:\Apache24\www\xd_ccms\database\migrations\2021_05_13_105246_create_billnum_table.php:7 Stack trace: #0 {main} thrown in D:\Apache24\www\xd_ccms\database\migrations\2021_05_13_105246_create_billnum_table.php on line 7