Can't calibrate power monitor current draw

Hey friends! I’m trying to get current sensing working on my rig. I’m using one of these PDB hooked up to a Cube on a quad.

When I go to the power monitor tab in MP, it throws an error saying something like “set amp per volt failed”. I can calibrate the voltage no problem, but can’t do anything to the amps. It still shows amp draw on the flight data screen, but it’s considerably off.

Any help is much appreciated!

I think some changes have been made so try using the full parameters page.

See release notes Copter 3.6.0-rc1 19-Apr-2018