Fatal error: Uncaught Error: Class "Google\Cloud\Core\Testing\Reflection\ReflectionHandlerV5" not found in D:\programs\xampp\htdocs\backend-test\vendor\google\cloud-core\src\Testing\Reflection\ReflectionHandlerV6.php:28 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\backend-test\vendor\google\cloud-core\src\Testing\Reflection\ReflectionHandlerV6.php on line 28