Pixhawk 4 mini Attitude estimator nur running

Pixhawk
1

Hello, I can not calibrate level horizon. The message is:
[cal] calibration started: 2 level
attitude estimator nor running - check system boot
[cal] calibration failed: level

Pixahwak 4 Mini FMUv5
Firmware Version 1.9.0
Airframe: Quadrotor x