Fatal error: Uncaught Error: Class 'think\migration\command\Seed' not found in E:\xampp\htdocs\www\TT\ThinkPHP\vendor\topthink\think-migration\src\command\seed\Run.php:18 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\TT\ThinkPHP\vendor\topthink\think-migration\src\command\seed\Run.php on line 18