Error 063: Training EXE not supported

Hi, for some Z-strategies I get an error 063 saying "Training EXE not supported". I wonder why. Do I need a Zorro S for that feature using the Z strategies? When I write my own one I can train it.

The Z systems can be only trained with Zorro S, but you need not train them anyway since we're doing that with every update.

Thanks for the answer.