ios facebook sdk 4.28.0登录错误代码3

Question

我使用以下方法登录，并始终返回：

  

错误Domain = com.facebook.sdk.core Code = 3“（null）”UserInfo = {com.facebook.sdk：FBSDKErrorDeveloperMessageKey =构建URL的未知错误。}。

     FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    [login
     logInWithReadPermissions: @[@"public_profile"]
     fromViewController:self
     handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
         NSLog(@"facebook login result.grantedPermissions = %@,error = %@",result.grantedPermissions,error);
         if (error) {
             NSLog(@"Process error");
         } else if (result.isCancelled) {
             NSLog(@"Cancelled");
         } else {
             NSLog(@"Logged in");
         }
     }];