Why is Auth::attempt always returns false in Laravel 5.1

I have this code:

 public function postLogin(Request $request) {


    if(Auth::attempt(['username' => $request->username, 'password' => $request->password]))
    {
        return redirect()->intended('users/dashboards');
    }else{
        return redirect('/')->withInput()->with('message', 'Login Failed');
    }
}

Here's my controller:

  Route::get('/', ['as' => 'home', 'uses' => 'HomeController@Home']);
  Route::post('post-login', ['as' => 'post_login', 'uses' => 'HomeController@postLogin']);

  Route::group(['middleware' => 'auth', 'prefix' => 'user'], function(){
    Route::get('dashboards', ['as' => 'dashboards', 'uses' => 'HomeController@getDashBoards']);
  });

I don't know why it always return false. I'm testing if the user is authenticated or not. If I use Auth::check() it returns false but if I use Auth::guests it return true. I'm too confused in middleware. Can somebody help me?

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