Class 'SimpleXMLElement' not found in Laravel 5.6

I am getting below error in my laravel 5.6 project.

"message": "Class 'SimpleXMLElement' not found",
"exception": "Symfony\\Component\\Debug\\Exception\\FatalThrowableError

I have checked my AWS ami server.All the modules like SimpleXMLElement and phpxml installed .But i am getting this error.

via Chebli Mohamed