Error Dialog Box

Hi, I’m using a drone copter from Harris Aerial H6. We did flight planning using Mission Planner 1.3.74 build 1.3.7592.19922. I’ve created a flying mission, then I’ve saved the waypoint. I want to write a waypoint, but why does this error dialog box appear?

first thing is to try update to 1.3.76 see if the error still persist.