TokenMismatchException in VerifyCsrfToken.php

Most this error occurred when you forget to add csrf_token field in form tag and  in #laravel 5+ csrf_token field will be automatically when you call Form::open

call following code for .blade template

{!! Form::hidden('_token', csrf_token()) !!}

call following code for non .blade template.

<input type="hidden" value="{{csrf_token()}}" name="_token" />

Another Solution when $sessionToken and $token are different.

This may be server issue or server configuration ask server’s administration to restart the server