Stop and start again problem

Hi, after de-activated follow mode to change aircraft position then I cannot start follow mode again with mesage “aircraft must be in the air”, please help on this issue, I use mavic air 1 with xiomi mi8

You should only get that error if the DJI SDK reports that the drone is not flying/in the air when you set the Follow altitude/distance from current drone position

Understood that, as I mention above the aircraft still in the air, I just change the position then want to start follow mode again but get that message