Animation and Rigging Tools: FAQ, Known Issues and Feature Roadmap

I keep getting this error when I try to get a picture of the rig to build a control rig,
My maya version is 2017 last service pack and I have the latest art version from marketplace.

Error: RuntimeError: file C:/Users/user/Documents/maya/2017/scripts/MayaTools/General/Scripts\ART_skeletonBuilder_UI.py line 8758: Error occurred during execution of MEL script

line 1: Invalid argument: displayRGBColor