I'm using Maya 6 Complete. Create Curve from Edges - one of the bonus tools doesn't seem to work. Is anyone else having this problem?

I'm getting the error:

Error: Wrong number of arguments on call to createCrv.

This tells me nothing because I've tried all combinations from 1 edge to several. I've turned history on and off. I've deleted history. I've saved, shut down etc.

ideas?