发布流显示时没有图像-Facebook

我正在使用C_中的Facebook开发者工具包3.0构建一个小型Facebook应用程序。我有一周前用过的这段代码。出于某种原因,当我尝试发布我的提要时,它出现时没有图像,也没有Flash电影。这是我的代码:

string userName = FacebookAPI.Users.GetInfo().name;
string message = "";

attachment attach = new attachment();

attach.href = string.Format(@"http://apps.facebook.com/{0}/?uId={1}&uName={2}", Consts.APP_NAME, ViewerUserId, userName);

attachment_media_flash flash = new attachment_media_flash();
flash.type = attachment_media_type.flash;
flash.expanded_width = 320;
flash.expanded_height = 260;
flash.height = 100;
flash.width = 130;

message = "";
attach.name = ""
attach.caption = "this works";
attach.description = ""
flash.imgsrc = string.Format(@"{0}/flash/Pinguin.JPG", Consts.DOMAIN_NAME);
flash.swfsrc = string.Format(@"{0}/flash/pinguin.swf", Consts.DOMAIN_NAME);

List<attachment_media> attach_media_list = new List<attachment_media>();
attach_media_list.Add(flash);

attach.media = attach_media_list;


/* action links */
List<action_link> actionlink = new List<action_link>();

action_link al1 = new action_link();
al1.href = string.Format(@"http://apps.facebook.com/{0}", Consts.APP_NAME);
al1.text = "myApp";

actionlink.Add(al1);
FacebookAPI.Stream.Publish(message, attach, actionlink, null , Convert.ToInt64   (ViewerUserId));