HB EP construction: metallic wall

Hi all,
I need to build an exterior wall whose outer layer is made of corrugated steel. I built the EP opaque material but when I connect it to the HB-EP construction I get this error:

  1. Solution exception:‘NoneType’ object has no attribute ‘upper’
    Could anyone help me? Thanks in advance
    Patricia

corrugated_ steel.gh (35.1 KB)

@PatriciaEdithCampore

It worked fine when I attached the material definition to the construction component and not only the name.

3examples.gh (473.9 KB)

Great! It works! Thanks a lot!