I'm new to Mythbuntu, just trying to get started. When I try to scan channels in the backend setup I get a message 'Error parsing parameters'

I found a few hits searching but nothing that fixes it.

Running Mythbuntu 11.04 64 bit with a TBS6981 dual DVB-S2 tuner card. I am fairly sure that the drivers are installed correctly now, followed instructions from their blog page.

Any ideas what can be wrong?