Question about new Piper plug-in

Piper works on edges. Each edge can be thought of as an axis for a pipe. So, if you want to make something in the shape of the face of a cylinder, you’d right click on the face you want and select ‘Edges’ and then run the Piper plugin.

I’ve downloaded the Piper.dll but when I try and select a cylinder face, run the Pipe Engineer plug-in, the program comes up with the error:

‘You must select one or more edges on an object for this plug-in to work’

Any ideas where I’m going wrong?