Fatal error: Uncaught Error: Interface 'PHPUnit\Framework\MockObject\Stub' not found in C:\xampp\htdocs\fiveplus\vendor\phpunit\phpunit-mock-objects\src\Stub\ReturnCallback.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fiveplus\vendor\phpunit\phpunit-mock-objects\src\Stub\ReturnCallback.php on line 15