Dronekit-python from Raspberry Pi to Pixhawk

Hi,

I am having issues setting up dronekit / Mavlink for my Raspberry Pi to communicate with a Pixhawk and would appreciate some assistance.

Not really sure what i have done wrong. I followed the Ardupilot documentation:
http://ardupilot.org/dev/docs/raspberry-pi-via-mavlink.html
http://python.dronekit.io/guide/quick_start.html#installation

I feel like there is an issue with my Mavlink setup. I have attached images of the errors i am receiving.

I would appreciate any advice or referrals to guides that could assist with installation.

Regards
Ben

My configuration:
Ardurover Firmware 3.4.2
MP 1.3.58.1 build 1.3.6841.9548
Pixhawk 2.4.8
Raspberry Pi 3B with latest Raspbian Stretch