Fatal error: Uncaught ReflectionException: Class PHPUnit\Framework\Constraint\Constraint does not exist in C:\xampp\htdocs\wasteman\scssphp\vendor\symfony\phpunit-bridge\ConstraintTrait.php:16 Stack trace: #0 C:\xampp\htdocs\wasteman\scssphp\vendor\symfony\phpunit-bridge\ConstraintTrait.php(16): ReflectionClass->__construct('PHPUnit\\Framewo...') #1 {main} thrown in C:\xampp\htdocs\wasteman\scssphp\vendor\symfony\phpunit-bridge\ConstraintTrait.php on line 16