How it is possible to create a deformer in the master control, using 2 deformers in an object:
for example an eyebrow or a character’s torso, using envelope and line deformation.
The error that happens is:
" Cannot create Master Controller: Invalid or empty selection."
You need your DISPLAY to be under a Composite, that your Master Controller of deformer NODE is connected to, and having that DISPLAY active. It frustrated me also too much before i understood the way this works, and come to that conclusion.
You prolly had a drawing isolated with a display node. I was always trying to go back to blender cause of this frustration…
Tip. When you are creating a deformer on deformer be sure to have on your envelope deformer enough points so that you can animate it with the curve deformer
I don’t know if it has already solved the problem, but I still lacked to activate a property of the Rigging tool, which says: Automatically create a group when creating a new deformation rig.