Ios4 关于iphone对话提要的facebook sdk问题

我使用此代码从iphone中的应用程序在facebook上发布信息

   NSString *title=[NSString stringWithFormat:@"Posted from Poems of Love v2 iPhone/iPod/iPad touch app - { Poem Name: "]; 
//& titletext.text & ""\",";
 NSString *alltitle= [title stringByAppendingString:poemtitle.text]; 
alltitle= [alltitle stringByAppendingString:@" } - { Author:"];
alltitle= [alltitle stringByAppendingString:authorname.text]; 
NSString *alltitle1= [alltitle stringByAppendingString:@" }"]; 

    NSString *list = poembody.text;
    NSString *kAppId=@"numid";
    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                   kAppId, @"app_id",
                                   @"http://www.poemsofloveapp.com", @"link",
                                   @"http://3.bp.blogspot.com/_co4MVQE_2l0/TPRh6TBjaZI/AAAAAAAAAOg/E0kgWLd4ieE/s1600/poemsoflovev2logo.png", @"picture",
                                   alltitle1, @"name",
                                   @"\nhttp://www.poemsofloveapp.com - Join us on facebook!\n", @"caption",
                                   list, @"description",
                                   @"",@"message",
                                   nil];
    [mainDelegate._session dialog:@"feed" andParams:params andDelegate:self];

当我点击“跳过”或“发布”时，会出现第二个对话框，该对话框为空！没有留言什么都没有

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为什么会发生这种情况？

我的错误对不起，伙计们，我打电话给[main delegate.\u会话对话框：@“feed”和params:params和delegate:self]； 两次以前的愚蠢我知道