[ekf2] no available instance

Hello,

I am trying to simulate a drone on Gazebo using the tutorial:

When I run the command

make px4_sitl gz_x500

it returns with a warning

WARN [health_and_arming_checks] Preflight Fail: ekf2 missing data

and when I check the ekf2 status:

pxh> ekf2 status
INFO [ekf2] available instances: 0
WARN [ekf2] selected instance: None

I would really appreciate it if anyone could help me find or solve the problem. Thank you.