Error: walking behaviour doesn't work with Head turner behaviour

There are two separate usages for profiles - Head Turner behavior and Walk behavior. They use the same concept of profiles, but are independent really. Normally you have full body profiles for walking left and right (and more recently left quarter and right quarter as well). You also have a standing profile. Then there are frontal/left/right/left-quarter/right-quarter profiles for head turns (e.g. controlled by webcam).

How to use them together? That is up to you. You could have full body profiles with head turns under that. Or you could have head turns independent to the body turns (I think). Or only have head turns, or only body turns. You need to plan that out in your mind. When walking, what should the head do? E.g. you could do head turns only on the standing puppet, not on th walk profiles. Or you could want to be able to turn the head while walking etc.

So it sounds like you have head turn profiles defined in the artwork. At a guess that is independent to walk profiles which are typically the full body (arms and legs etc). You may need to add body profiles to the artwork. Then you have to decide whether the head should stay the same when walking or not, whether you need head turns while walking, etc. That is a choice you need to make. Exploring some of the existing sample puppets with walk and head turner behaviors might be interesting to explore this more.