Running Dronekit on PX4 NAVIO2

SUB: NAVIO2 with Dronekit

I’m trying to run PX4 on the NAVIO using dronekit scripts in OFFBOARD mode and I’m getting this error…

Executing mission
Exception in message handler for HEARTBEAT
mode 67371008 not available on mavlink definition
Waiting for vehicle to arm…
ARMED by arm/disarm component command
Exception in message handler for HEARTBEAT
mode 67371008 not available on mavlink definition
Waiting for vehicle to arm…
Exception in message handler for HEARTBEAT
mode 67371008 not available on mavlink definition

Its a message printed from dronekit…can’t find how the number is determined.