Laravel 5 - Error Call to undefined method Illuminate\Events\Dispatcher::fire()

i'm start to programing ApiRest with JWT. The login route is good, but the router in group "middleware jwt.auth" not funk.

Error:

Symfony\Component\Debug\Exception\FatalThrowableError: Call to undefined method Illuminate\Events\Dispatcher::fire()

My code:

Route::group(['namespace' => 'Api'], function(){

    Route::get('user/login', 'AuthController@login');

    Route::group(['middleware' => ['jwt.auth']], function() {            
        Route::get('auth/me', 'AuthController@me');
    });
});

Help me pls.

I'm testing the router api with Postman

via Chebli Mohamed