Error while submitting form Laravel 5.6 - laravel

Question

I have code in router:
/**************Quản lý user*****************/
Route::get('admin/manage-user', 'UserController#getList')->middleware('admin');
Route::get('admin/manage-user/add', 'UserController#indexAdd')->middleware('admin');
Route::post('admin/manage-user/add', 'UserController#getAdd')->middleware('admin');
Code in UserController:
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\User;
use App\Http\Requests\AddUserRequest;
class UserController extends Controller
{
//
public function getList()
{
$data = User::paginate(10);
return view('admin.manage-user',['data' => $data]);
}
public function indexAdd()
{
return view('admin.add-user');
}
public function getAdd(AddUserRequest $request)
{
if($request->fails())
return view('admin.add-user')->withInput();
}
}
Code in AddUserRequest
<?php
namespace App\Http\Requests;
use Illuminate\Foundation\Http\FormRequest;
class AddUserRequest extends FormRequest
{
/**
* Determine if the user is authorized to make this request.
*
* #return bool
*/
public function authorize()
{
return true;
}
/**
* Get the validation rules that apply to the request.
*
* #return array
*/
public function rules()
{
return [
'username' => 'required|max:200',
'email' => 'required|email|unique:users',
'pass1' => 'required|min:6',
'pass2' => 'required|same:pass1',
];
}
}
Code view errors:
#extends('layouts.admin')
#section('title','Add User')
#section('content')
<div class="row">
<div class="col-md-3"></div>
<div class="col-md-6">
<div class="box box-primary">
<div class="box-header with-border">
<h3 class="box-title">Add User</h3>
</div>
<!-- /.box-header -->
<!-- form start -->
<form role="form" action="{{url('admin/manage-user/add')}}" method="post">
<div class="box-body">
<div class="form-group">
#if ($errors->any())
<div class="alert alert-danger">
<ul>
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif
</div>
When running the path: http://localhost/LBlog/public/admin/manage-user/add and submit (Do not enter form information), the screen returns error: The page has expired due to inactivity. Please refresh and try again.
I hope someone can help me with this issue

Answer 1

That error appears due to CSRF token.
Add csrf token in your form.
<form role="form" action="{{url('admin/manage-user/add')}}" method="post">
#csrf
<div class="box-body">
<div class="form-group">
#if ($errors->any())
<div class="alert alert-danger">
<ul>
#foreach ($errors->all() as $error)
<li>{{ $error }}</li>
#endforeach
</ul>
</div>
#endif
</div>