Recently i am working on laravel 5.1 framework and trying to make user login by Social Authentication like facebook login .. i followed this tutorial from youtube Laravel 5.1 Socialite Authentication
but get this Exception
InvalidStateException in AbstractProvider.php line 191:
in AbstractProvider.php line 191
at AbstractProvider->user() in SocialAuthController.php line 61 at SocialAuthController->github_Callback() at call_user_func_array(array(object(SocialAuthController), 'github_Callback'), array()) in Controller.php line 256 at Controller->callAction('github_Callback', array()) in ControllerDispatcher.php line 164
Here is my code
// facebook Sociolite for routing 
Route::get('/auth/facebook', 'Auth\SocialAuthController@redirectToProvider');
Route::get('callback_facebook', 'Auth\SocialAuthController@handleProviderCallback');
// AuthController
 <?php
 namespace App\Http\Controllers\Auth;
 use Illuminate\Http\Request;
 use App\Http\Requests;
 use App\User;
 use Validator;
 use App\Http\Controllers\Controller;
 use Illuminate\Foundation\Auth\ThrottlesLogins;
 use Illuminate\Foundation\Auth\AuthenticatesAndRegistersUsers;
 use Socialite;
 use Auth;
 use redirect;
 class AuthController extends Controller
 {
     class SocialAuthController extends Controller{   
     // For Facebook
     public function redirectToProvider(){
        return Socialite::driver('facebook')->redirect();
     }
     public function handleProviderCallback(){
        $curl = curl_init();
        curl_setopt($curl , CURLOPT_SSL_VERIFYPEER, false);
        $user = Socialite::driver('facebook')->user();
        $data = ['name'=>$user->name, 'email'=>$user->email,    'password'=>$user->token];
        $userDB = User::where('email',$user->email)->first();
        if (!is_null($userDB)){
            Auth::login($userDB);
        }
        else{
            Auth::login($this->create($data));
        }
        return redirect('/pages/profile');
    }
  }
}
    config\service.php
    'facebook' => [
        'client_id' => '513845902100524',
        'client_secret' => '135699237e16cd3a50d2cbfec3a5e58c',
        'redirect' => 'http://localhost:8000/callback_facebook',
    ],