Ekf Failsafe Problem for SITL

Hello, I am following the basic Software in the loop tutorial: https://ardupilot.org/dev/docs/rover-sitlmavproxy-tutorial.html#

After writing arm throttle , I try to set a position with right click, and say fly to , but keep getting the failsafe error. What could be the reason? There is no hardware.

Thank you,

I solved the issue, thanks to rmackay9’s reply: https://github.com/ArduPilot/ardupilot_wiki/issues/2708

There is no Failsafe problem, I just forgot to write GUIDED, before writing arm throttle.