Pixhawk 2.1 "unexpected WHOAMI"

ArduCopter Copter 3.6
1

Hi All

I am using ArduCopter3.5.7 in Pixhawk 2.1.

ERROR%20--LSM303D%20and%20LSM9DS0%20-%20unexpected%20WHOAMI

I am getting this error message in Terminal TAB.
Kindly help about this error…