Route doesn't work on my laravel 5.1 project

I'm trying to define routes to access to some views, but it doesn't work :/

Route::group(['prefix' => 'messages'], function () {
Route::get('/', ['as' => 'messages', 'uses' => 'MessagesController@index']);
Route::get('create', ['as' => 'messages.create', 'uses' => 'MessagesController@create']);
Route::post('/', ['as' => 'messages.store', 'uses' => 'MessagesController@store']);
Route::get('{id}', ['as' => 'messages.show', 'uses' => 'MessagesController@show']);
Route::put('{id}', ['as' => 'messages.update', 'uses' => 'MessagesController@update']);

});

I'm always redirected to the home view ('/') of my project when I'm logged.

If I try to access as guest for example : http://ift.tt/258ri8R I receive a 404 error !

The package that I try to put in my project is : http://ift.tt/1vax87u

I've installed it on a fresh installation of laravel 5.1 and it's work, but on my project it doesn't work !

My project is in local with MAMP PRO

via Chebli Mohamed