使用新的 sdk 在我的 Facebook 墙上发布

我正在使用新的 Facebook SDK 通过以下方式在我的墙上发布他们的指示 http://developers.facebook.com/docs/howtos/publish-to-feed-ios-sdk/

我从应用程序获得了授权，但是当我尝试发布时出现错误Error: HTTP status code: 400下面我发布了我的代码

 - (void)viewDidLoad
{
self.postParams =
 [[NSMutableDictionary alloc] initWithObjectsAndKeys:
 @"https://developers.facebook.com/ios", @"link",
 @"https://developers.facebook.com/attachment/iossdk_logo.png", @"picture",
 @"Facebook SDK for iOS", @"name",
 @"build apps.", @"caption",
 @"testing for my app.", @"description",
 nil]; 

[self.postParams setObject:@"hgshsghhgsls" forKey:@"message"];

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

-(IBAction)Post{
AppDelegate *appDelegate = [UIApplication sharedApplication].delegate;
[appDelegate openSessionWithAllowLoginUI:YES];


[FBRequestConnection   startWithGraphPath:@"me/Mac" parameters:self.postParams HTTPMethod:@"POST"
                        completionHandler:^(FBRequestConnection *connection,id result,NSError *error) {
                            NSString *alertText;
                             if (error) {
                             alertText = [NSString stringWithFormat:@"error: domain = %@, code = %d, des = %d",error.domain, error.code,error.description];
                             } 
                             else 
                             {
                             alertText = [NSString stringWithFormat:@"Posted action, id: %@",[result objectForKey:@"id"]];
                             }
                             // Show the result in an alert
                             [[[UIAlertView alloc] initWithTitle:@"Result" message:alertText delegate:self cancelButtonTitle:@"OK!"
                             otherButtonTitles:nil]show];
                        }]; 




}

我在这里做错了什么，任何建议都会很好，这个新的 SDK 是测试版？还是完整的？

如果遇到任何问题，请尝试在您有兴趣调试的请求调用之前添加以下代码来打开日志记录：

[FBSettings setLoggingBehavior:[NSSet setWithObjects:FBLoggingBehaviorFBRequests, FBLoggingBehaviorFBURLConnections, nil]];