Hi Danny, a script error like that is meant to give debugging information to the person developing the script, it's a bug when you see those in a finished script.

I'll fix that up for the next beta release, thanks for reporting it.

At some point I want to figure out a good place where things could give feedback on error situations like things being not all in the same plane like this case. I have not yet figured out a good place to stick error messages like that though, I kind of need some area of the UI where several lines of text messages can be streamed out.

- Michael