Unable to send emails in laravel 5 app

Hello I have a laravel 5 app which is working perfectly in local environment. But in production emails are not getting sent instead I get the exception below:

1/1 FatalErrorException in AstAnalyzer.php line 125:
    Cannot instantiate interface PhpParser\Parser

Path to file: /vendor/jeremeamia/SuperClosure/src/Analyzer/AstAnalyzer.php line 125

I don't get it because right now I am testing same function in local and is working. Every other path of the app is working except this one.

via Chebli Mohamed