Fatal error: Uncaught Error: Class "PHPStan\Testing\TypeInferenceTestCase" not found in D:\xampp\htdocs\SSWPOS\vendor\ramsey\collection\tests\TypesTest.php:12 Stack trace: #0 {main} thrown in D:\xampp\htdocs\SSWPOS\vendor\ramsey\collection\tests\TypesTest.php on line 12