Symfony\Component\HttpKernel\Exception\HttpException Error in Laravel 5.4

I Want Register user with modal And Rapid Authentication,I'm Using Ajax for sent data.My Code is here:

<div class="modal fade" tabindex="-1" role="dialog" id="mySignup"><div class="modal-dialog" role="document"><div class="login-wrap"><div class="form text-center"><input type="text" name="name" id="name"/><input type="email"  name="email" id="email"/><input type="password" name="pw" id="password"/><button id="SignUp">Signup</button></div></div>        {{csrf_field()}}</div></div><script>$(document).ready(function () {    $('#SignUp').click(function (event) {        var name = $('#name').val();        var email = $('#email').val();        var password =$('#password').val();        $.post('/register',{'name' : name,'email' :email,'password':password,'token':$('input[name=_token]').val()        });    });});</script>

And In Web.php I'm Using this code:

Route::post('/register',['as'=> '','uses' => 'Auth\RegisterController@Register' ]);

But When I Want SignUp I give this Error message with 419 status code{message: "", exception: "Symfony\Component\HttpKernel\Exception\HttpException",…}How I Can fix this problem?