Login pelo facebook

Pessoal estou com sistema de login pelo facebook, porem estou com um erro. Apos clica em entrar pelo facebook e autorizar aplicativo, quando volta pro site aparece esse erro:

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Codigo do erro:

 public function facebook()
 {
 $facebook = $this->socialauthRepository->facebook();
 $user = $facebook->getUser();

 //try get the user profile
 try {
 $userProfile = $facebook->api('/me');
 } catch(\FacebookApiException $e) {
 $user = null;
 }

 if ($user) {

 $needEdit = false;

 if (empty($userProfile['email'])) {
 $needEdit = true;
 }

 $username = \Str::slug($userProfile['name']);
 $username = str_replace([' ','.', '-'], ['','', ''], $username);

 $details = [
 'fullname' => $userProfile['first_name']. ' '. $userProfile['last_name'],
 'genre' => $userProfile['gender'],
 'country' => '',
 'email_address' => (isset($userProfile['email'])) ? $userProfile['email'] : '',
 'password' => time(),
 'username' => $username,
 'auth' => 'facebook',
 'authId' => $userProfile['id'],
 'avatar' => ''
 ];

 try{
 ini_set('user_agent', 'Mozilla/5.0');
 $avatar = json_decode(file_get_contents('https://graph.facebook.com/'.$userProfile['id'].'/picture?redirect=false&width=600&height=600'), true);

 if ($avatar and isset($avatar['data']['url'])) {
 $avatar = $avatar['data']['url'];
 $details['avatar'] = $avatar;
 }
 } catch(\Exception $e){}

 return $this->socialauthRepository->register($details);

 } else {
 $url = $facebook->getLoginUrl(['scope' => 'email']);

 return \Redirect::to($url);
 }
 }