Thanks for the report, it was a python 3.10 issue. I have fixed it now. Download the new version
Here is information on how to calibrate.
and
https://ardupilot.org/copter/docs/common-power-module-configuration-in-mission-planner.html#analog-monitor-calibration
Do not takeoff without correcting the points explained above and re-doing all the steps 05 to 19 (and skipping 11)