Fatal error: Uncaught Error: Interface 'PHPUnit\Framework\SelfDescribing' not found in E:\xampp\htdocs\key1\vendor\phpunit\phpunit-mock-objects\src\Matcher\Invocation.php:20 Stack trace: #0 {main} thrown in E:\xampp\htdocs\key1\vendor\phpunit\phpunit-mock-objects\src\Matcher\Invocation.php on line 20