I have loaded an existing puppet into CH Beta, but cannot turn on body tracker

The existing puppet works as it does in CH i.e. facial and eye movements, head and dragable parts etc, however when exictedly loaded the puppet into the CH BETA version. I expected to hit the body tracker to turn it blue and have some fun. The problem I am having is that it will not turn on (blue) but gives me a message that I do not understand, it says "Body tracker requires a puppet with an armed (active) and enabled Body behavior" how do I resolve this please?

I have been a long time user of photoshop but not of CH and I have just converted one of my characters for a kids book into a CH puppet, so it may be somnething I have not done in the commercial CH program.