Class 'Laraveldaily\Quickadmin\QuickadminServiceProvider' not found for php artisan in Laravel

I want to install quickadmin to create a quick admin panel, I am using Laravel 5.3 and I have followed the step to install:

1. Create new project

   composer create-project laravel/laravel ProjectName --prefer-dist

2.Install quickadmin

composer require laraveldaily/quickadmin

3. Add Laraveldaily\Quickadmin\QuickadminServiceProvider::class, to your \config\app.php providers after App\Providers\RouteServiceProvider::class,

4. Configure your .env file with correct database information

5. Run php artisan quickadmin:install and fill the required information.

but this error appear

[Symfony\Component\Debug\Exception\FatalThrowableError]              
  Class 'Laraveldaily\Quickadmin\QuickadminServiceProvider' not found  

What's happend?

via Chebli Mohamed