Facebook iOS SDK-将自定义操作和对象发布到用户活动提要

我有下面的代码，它应该向当前用户的提要添加一个对象

id<FBOpenGraphAction> object = (id<FBOpenGraphAction>)[FBGraphObject graphObject];
            [object setObject:@"namespace:objectName" forKey:@"type"];
            [object setObject:@"Object Title" forKey:@"title"];

            [FBRequestConnection startForPostWithGraphPath:@"me/namespace:actionName"
                                               graphObject:object
                                         completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
                                             if (error) {
                                                 NSLog(@"Error: %@", error.userInfo);
                                             } else {
                                                 NSLog(@"Success!!");
                                             }
                                         }];

id对象=（id）[FBGraphObject-graphObject]；
[对象集对象：@“命名空间：对象名”forKey:@“类型”]；
[对象集对象：@“对象标题”forKey:@“标题”]；
[FBRequestConnection startForPostWithGraphPath:@“me/命名空间：actionName”
graphObject:对象
completionHandler:^（FBRequestConnection*连接，id结果，NSError*错误）{
如果（错误）{
NSLog（@“Error:%@”，Error.userInfo）；
}否则{
NSLog（@“Success！！”）；
}
}];

但是，我得到以下错误：

2013-06-18 23:12:31.846 Events[707:60b] Error: {
    "com.facebook.sdk:ErrorSessionKey" = "<FBSession: 0x14ff95a0, state: FBSessionStateOpen, loginHandler: 0x14dde700, appID: 474218799329968, urlSchemeSuffix: , tokenCachingStrategy:<FBSessionTokenCachingStrategy: 0x14dde850>, expirationDate: 4001-01-01 00:00:00 +0000, refreshDate: 2013-06-18 22:12:06 +0000, attemptedRefreshDate: 0001-12-30 00:00:00 +0000, permissions:(\n    \"basic_info\"\n)>";
    "com.facebook.sdk:HTTPStatusCode" = 500;
    "com.facebook.sdk:ParsedJSONResponseKey" =     {
        body =         {
            error =             {
                code = 1611072;
                message = "The action you're trying to publish is invalid because it does not specify any reference objects. At least one of the following properties must be specified: event.";
                type = Exception;
            };
        };
        code = 500;
    };
}

2013-06-18 23:12:31.846事件[707:60b]错误：{
“com.facebook.sdk:ErrorSessionKey”=”；
“com.facebook.sdk:HTTPStatusCode”=500；
“com.facebook.sdk:ParsedJSONResponseKey”={
正文={
错误={
代码=1611072；
message=“您尝试发布的操作无效，因为它未指定任何引用对象。必须至少指定以下属性之一：事件。”；
类型=异常；
};
};
代码=500；
};
}

您是否已解决此问题？我面临着同样的问题，不知道如何解决它。你能帮助我吗？