Fatal error: Uncaught Error: Class "PHPUnit\Framework\Constraint\Constraint" not found in C:\wamp64\houda\vendor\symfony\console\Tester\Constraint\CommandIsInvalid.php:17 Stack trace: #0 {main} thrown in C:\wamp64\houda\vendor\symfony\console\Tester\Constraint\CommandIsInvalid.php on line 17