WAM : material list is empty

Hi,
I apologize, I’m French and English is not my natural language (and I am 70 !) !
I ‘work’ in a fablab. We have bought a Wazer deskpro but it is not yet in function. I want to train with WAM. So I created an account; I made a small piece with Inkscape (with object to path !). I can read the .svg file in WAM; I can move it and scale it. But the Material list is empty.

What have I missed ?

Thanks in advance
Jean in Grenoble