Fatal error: Uncaught Error: Interface "PHPUnit_Framework_MockObject_Stub" not found in C:\xampp\htdocs\php\pear\PHPUnit\Framework\MockObject\Stub\ReturnCallback.php:56 Stack trace: #0 {main} thrown in C:\xampp\htdocs\php\pear\PHPUnit\Framework\MockObject\Stub\ReturnCallback.php on line 56