Fatal error: Uncaught Error: Class "PHPUnit\Framework\Constraint\Constraint" not found in D:\Webserver\Apache24\htdocs\laravel\basic\vendor\symfony\mime\Test\Constraint\EmailHeaderSame.php:18 Stack trace: #0 {main} thrown in D:\Webserver\Apache24\htdocs\laravel\basic\vendor\symfony\mime\Test\Constraint\EmailHeaderSame.php on line 18