Px4 Fixed Wing Land Aborted

Guys, I need to fix this issue. I am a new learner of px4. When I run my script, I always see the message. Could you help me? My vehicle is fixed wing.

More information would be useful:

Your simulation doesn’t seem to include a distance sensor topic. By default the FW landing logic aborts the landing if there is no valid distance to ground estimate (from a distance sensor). You can disable this check by setting FW_LND_USETER to 0.

Guys. I’ve solved the problem. I’ve deleted the ubuntu and installed all programs. And it’s solved.