Distancia 3D inavlida

Can anyone help me? I couldn’t make the flight because of this message! I prepare it in Qgroud then use the lychee

3D distance invalidates route point 51e 51 the valid range is (0,6,1999) m

In order to help diagnose the mission, you’ll need to share it.

This makes no sense, probably the actual message you get is:

“Invalid 3D distance between waypoint 51 and 52, valid range is (0.6,1999)m”

It means you have 2 waypoints in your mission that are either
-Too close to each other (closer than 0.6m)
or
-Too far from each other (farther than 1999m)

Check the coördinates and altitude of waypoints 51 & 52.