WebSocket SharedConnection Error

Hi Caché-Developers!

My Caché Version: 2014.1 and the CSP-Gateway Version ( + Apache) also. I can't upgrade now. 

I want create a Web-Socket for my Chat  like in that Tutorial:

https://community.intersystems.com/post/tutorial-websockets

And there's my problem. When I set SharedConnection like:

set ..SharedConnection = 1

I get on init connection with the server that message:

First i think everything is okay but here i also didn't get the Messages on init from Server-Side:

When I now send a message to the WebSocket, I got following error:

Without SharedConnection = 1, everything works fine for me.

What's wrong and how can I use SharedConnection = 1 like in the tutorial?

Thanks and best regards!