Incompatible Channels in Material Designer

Hi,

Woking on Mac - OSX.
Just trying to learn Motion Design for the last couple of weeks.

This question is about Material Designer..

Started very good with 5.6, but after upgrading to 5.7 yesterday I have trouble with Material Designer (this happens to all kind of objects):

After pressing Continue, I am not able to use “Base Color”:

Material Designer states that Base color is incompatible.

I suppose this is a beginner question, have tried to google, but not much to find..

Thanks, Jarle