Fatal error: Uncaught Error: Interface "PHPUnit\Framework\MockObject\Stub" not found in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/phpunit/phpunit-mock-objects/src/Stub/ReturnArgument.php:18 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/phpunit/phpunit-mock-objects/src/Stub/ReturnArgument.php on line 18