shows token miss match exception in laravel form post

I have a simple form to create user registration, but when the form, submit it shows an error "token mismatch exception". I have already tried replacing the name field and id fields but I can't find what's wrong. can any one please tell me what's wrong?

<form action="http://ift.tt/1Lx9LQe" method="POST">
...............
......
</form>

via Chebli Mohamed