Websocket connection error on topic /tf

[lianbo2006]

I have run it successfully with the step in manual and demo video. However there is also an another wrong I have met. There will be a "Websocket connection error on topic /tf" showing in the terminal and gmapping will be down as will.
[ERROR][WallTime:1494406566.104157]Websocket connection error on topic /tf

[zhangjd1029]

I am a graduate student. Recently, I am learning the knowledge of cloud robot. The cloudroid framework you wrote is very good, and I am very interested in it. However, I have encountered the following problems in the process of code recurrence, and I want to ask you for help.
I have the cloudroid framework deployed on Aliyun and running it in my browser, but I don't know what ros installation package and json files to upload to the framework next. If it is convenient, could you please provide these two documents? If not, could you give me some advice or examples?
This is my email address: [email protected]
Looking forward to your reply.