使用带有ajax jquery的laravel时出现HTTP / 1.0 500内部服务器错误

Question

this is my jquery ajax

$.ajaxSetup({
    headers: {
        'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
    }
});    
$.ajax({
            type: 'post',
            url: '/login',
            data: {
                'email' : $('#txtEmail').val(),
                'password' : $('#txtPassword').val(),
            },
            dataType: 'json',
            success: function(data) {
                console.log(data);
            }
    });

i add meta in my html

<meta name="csrf-token" content="{{ csrf_token() }}">

my route like this

Route::post('/login', 'PenggunaController@login');

and my controller like this

use Illuminate\Http\Request;

class PenggunaController extends Controller
{
    public function login(Request $request){
        $email = $request->email;
        echo $email;
    }
}

please, can someone help me, what wrong with my code ?