Mode 67371008 not available on mavlink definition

I’ve just installed the most recent versions of dronekit and pymavlink using pip…now I’m still getting this error.

pat@pat-VirtualBox:~/Firmware/integrationtests/python_src/px4_it/dronekit$ python MissionCheck.py
Connecting
Type: 1
Armed?: False
System status: STANDBY
GPS: GPSInfo:fix=3,num_sat=10
Alt: -0.312
Waiting for home position…
Uploaded mission with 4 items
current mission sequence: 0

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