Fatal error: Uncaught Error: Interface 'PHPUnit\Framework\MockObject\Stub' not found in /var/www/html/login-server/vendor/phpunit/phpunit-mock-objects/src/Stub/ReturnCallback.php:15 Stack trace: #0 {main} thrown in /var/www/html/login-server/vendor/phpunit/phpunit-mock-objects/src/Stub/ReturnCallback.php on line 15