ESC Calibration Dialog: 'Set param error. AC3.3+'

Am trying to calibrate a single fixed-wing E-Flite ESC (Carbon Z Cub) using the Pixhawk 2.1 Black Cube. When I hit the ‘Calibrate’ ESC button in Arduplane V4.0.5 I get a dialog that says: "Set Param error. Please ensure your version is AC3.3+. Screenshot attached. The screenshot shows that Arduplane is using AC3.3+ … its quoted in the Calibrate ESC title bar. Also my ESC is no longer supplying power to the servo bus but works fine in terms of throttle min/max etc.

I think its only for chopper i have never used it on a plane
i have always done the old way

https://ardupilot.org/plane/docs/guide-esc-calibration.html

Latest is I’ve a Pixhawk 2.1 /Black Cube critical error notification from Mission Panner :wink: