Roles issue

BadMethodCallException Method Illuminate\Auth\SessionGuard::role does not exist. http://127.0.0.1:8000/login

This appear to me when I try to logged in with role

this is the code :

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller; use App\Providers\RouteServiceProvider; use Illuminate\Foundation\Auth\AuthenticatesUsers; use Illuminate\Support\Facades\Auth; use App\Role;

class LoginController extends Controller { /* |-------------------------------------------------------------------------- | Login Controller |-------------------------------------------------------------------------- | | This controller handles authenticating users for the application and | redirecting them to your home screen. The controller uses a trait | to conveniently provide its functionality to your applications. | */

use AuthenticatesUsers;

/**
 * Where to redirect users after login.
 *
 * @var string
 */
// protected $redirectTo = RouteServiceProvider::HOME;

protected function redirectTo(){

    if (Auth::role()->role_name == 'admin') {
        return route('dashboard');
    } elseif (Auth::role()->role_name == 'accountant') {
        return route('main');
    } elseif (Auth::role()->role_name == 'customer') {
        return route('index');
    } else {
        return redirect('/login')->with('status', 'يرجى إدخال إسم المستخدم وكلمة المرور');
    }

}

/**
 * Create a new controller instance.
 *
 * @return void
 */
public function __construct()
{
    $this->middleware('guest')->except('logout');
}

}