My walk forward command doesn't work

I just got Rhino 6 for computer. For some reason I cannot use my walk forward command. I’ve installed updates and that hasn’t worked. I posted image to show you the error message I get when I select the command. Can someone please help. Thanks.

2019-02-01_SN Questions.pdf (1.9 MB)

Hello - I guess the RhinoScript plug-in is not loading - can you check Options > Plug-ins for RhinoScript being enabled and loaded?