laravel5.7 ソーシャルログインエラー

前提・実現したいこと

いまlaravelでソーシャルログインを実装しているのですがエラーが起きてしまいました。

発生している問題・エラーメッセージ

"Argument 1 passed to Illuminate\Auth\SessionGuard::login() must implement interface Illuminate\Contracts\Auth\Authenticatable, instance of Laravel\Socialite\Two\User given, called in /var/www/vendor/laravel/framework/src/Illuminate/Auth/AuthManager.php on line 292 ◀"

該当のソースコード

routes/web.php

// for github login
Route::get('github', 'Github\GithubController@top');
Route::post('github/issue', 'Github\GithubController@createIssue');
Route::get('login/github', 'Auth\LoginController@redirectToProvider');
Route::get('login/github/callback', 'Auth\LoginController@handleProviderCallback');

app/http/Controllers/Auth/LoginControllers

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Http\Request;

use Socialite;
use Auth;
use App\User;


class LoginController extends Controller
{
    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = '/home';

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

     /**
     * Redirect the user to the GitHub authentication page.
     *
     * @return \Illuminate\Http\Response
     */
    public function redirectToProvider()
    {
        return Socialite::driver('github')->scopes(['read:user', 'public_repo'])->redirect(); 
    }

    /**
     * Obtain the user information from GitHub.
     *
     * @return \Illuminate\Http\Response
     */
    public function handleProviderCallback(Request $request)// 追加！
    {
        $github_user = Socialite::driver('github')->user();
        $app_user = User::where(['email' => $github_user->getEmail()])->first();

        if(empty($app_user)){
            // if the user doesn't have account
            $new_user = new User;
            $new_user->email = $github_user->getEmail();
            $new_user->provider_id = $github_user->getId();

            if(!$github_user->name){
                $new_user->name = $github_user->getNickname();
            }else{
                $new_user->name = $github_user->getName();
            }

            $new_user->save();
            Auth::login($new_user);
        } else {
            // if the user has already an account
            Auth::login($github_user);
        }

        $request->session()->put('github_token', $github_user->token);

        return redirect('github');
    }

}

app/http/Controllers/Github/GithubController.php

<?php

namespace App\Http\Controllers\Github;

use App\Http\Controllers\Controller;
use Socialite;
use Illuminate\Http\Request;

class GithubController extends Controller
{
    public function top(Request $request)
    {
        $token = $request->session()->get('github_token', null);

        try {
            $user = Socialite::driver('github')->userFromToken($token);
        } catch (\Exception $e) {
            return redirect('login/github');
        }

        return view('/home');
    }

    public function createIssue(Request $request)
    {
        $token = $request->session()->get('github_token', null);
        $user = Socialite::driver('github')->userFromToken($token);

        $client = new \GuzzleHttp\Client();
        $res = $client->request('POST', 'https://api.github.com/repos/' . $user->user['login'] . '/' . $request->input('repo') . '/issues', [
            'auth' => [$user->user['login'], $token],
            'json' => [
                'title' => $request->input('title'),
                'body' => $request->input('body')
            ]
        ]);

        return view('done', [
            'response' => json_decode($res->getBody())->html_url
        ]);
    }
}

試したこと

検索しましたが方法がわかりませんでした