Getting Controller does not exist after moving my controller to sub folder in laravel 5

I have created a resource full route which was pointing to a CRUD controller in App/Http/Controller/SeatController.php my Route in api.php

Route::resource('websites', 'SeatController');

I wanted to put all controllers related to Seat inside a directory. I created a directory named Seat and I moved all of my controllers related to Seat to it. it's path is : App\Http\Controllers\Seat\SeatController

before change it's path was : App\Http\Controllers\SeatController

After above changes I added Seat directory name to my resource full route like :

Route::resource('websites', 'Seat\SeatController');

But when I'm reaching this controller I get below error message :

Class App\Http\Controllers\Seat\SeatController does not exist

any one knows how to fix this ?

via Chebli Mohamed