i have an issue with my laravel project
currently i been working the register page, but it stuck at class controller not found

here's my route script
Route::get('/', function() {
return view('home');
});
Route::get('/signin', function() {
return view('login');
});
Route::get('/register', function() {
return view('register.register');
});
Route::post('/register_action','RegisterController@store');
the RegisterController script
<?php
namespace App\Http\Controllers;
//use App\RegisterController;
use Illuminate\Http\Request;
class RegisterController extends Controller
{
//
public function store(){
echo "test";
}
}
and view register blade
@extends('layout');
@section('content')
<h2>Vertical (basic) form</h2>
<form action="/register_action" method="post">
<input type="hidden" name="_token" value="{{csrf_token()}}">
<div class="form-group">
<label for="name">Name:</label>
<input type="name" name="username" class="form-control" id="name" placeholder="Enter Name">
</div>
<div class="form-group">
<label for="email">Email:</label>
<input type="email" name="email" class="form-control" id="email" placeholder="Enter email">
</div>
<div class="form-group">
<label for="pwd">Password:</label>
<input type="password" name="password" class="form-control" id="pwd" placeholder="Enter password">
</div>
<div class="form-group">
<label for="pwd"Confirm >Password:</label>
<input type="password" name="cpassword" class="form-control" id="pwd" placeholder="Confirm password">
</div>
<div class="checkbox">
<label><input type="checkbox" name="remember"> Remember me</label>
</div>
<button type="submit" class="btn btn-default">Submit</button>
</form>
@endsection