Hi Ronal, It seems you'd have to update your ghPython here: http://www.food4rhino.com/app/ghpython to the latest version (version 0.6.0.3 as of this writing). Don't forget to unblock the .gha file (right click >properties and select unblock at the bottom of the submenu) Or if you're using Rhino 6, ghPython is standard incorporated in Grasshopper. Good luck and let me know if this worked for you. Cheers, Arie