error #0079: you cannot connect to server version XXX with a newer version of the client (XXX)
You are trying to connect a new version of MyChat to the older version of MyChat Server.
MyChat Server and MyChat Client versions must match. If you faced this situation it means that you need to update your MyChat Server to the latest version.
As a rule, client applications are updated automatically directly from your MyChat Server. Mobile applications are updated from their markets.