Please provide exact steps how to modify the tutorial (11) so it wont work properly.
Provide: modified world, modified sources.

ground .create(Box(15,1,15,Vec(0,-2,0)),0); <-- a static mesh, load world instead so char would walk on terrain, not static mesh.

I need full code

I found the problem. When I overide your methods Chr (updateController) to do nothing, then it works without problems, Not sure why.

probably because updateController updates controller, and then you update it once again manually? so it's updated twicer per frame

Yes that was the problem, I thought I could update manually but it is now resolved.