我正在遵循sendbird的教程以连接到Android中的服务器，但得到以下响应：

com.sendbird.android.SendBirdException：连接已取消。

   {
      "School":"Arsenal 2011",//4th Element in new array
      "Group":{
         "Name":"Previous",//3rd Element in new array
         "ParentGroup":{
            "Name":"Arsenal",//2nd Element in new array
            "ParentGroup":{
               "Name":"USA",//1st Element in new array
               "ParentGroup":null
            }
         }
      },"GroupDisplayText":null,"Publisher":"Abbot","PublishedDate":"2011","PublishersWebsite":"http://google.com/USA/ADW%202011/Arsenal%202011.pdf"
   },{
      "School":"New York 2000","Group":{
         "Name":"New York","ParentGroup":{
            "Name":"USA","ParentGroup":null
         }
      },"Publisher":"DoE","PublishedDate":"2000","PublishersWebsite":"http://google.com/USA/New York%202000%20Tables.pdf"
   }