Body tracking requires a puppet with an armed (active) and enabled body behaviour

Hello Friend , 

I'm quite new to adobe Character animator software (Ch), I'm basically  a primary teacher by profession but to make few intresting videos for class I want to use a furry puppet and luckily I found it here:

https://pages.adobe.com/character/en/puppet-maker

on this page there is one puppet - fuzzy . i create a scene for this puppet and after that click on body tracking icon . as soon as I click this I'm getting this error - "Body tracking requires a puppet with an armed (active) and enabled body behaviour"

How can I fix this problem.Please guide.