Just as an update to this, I spent some time today trying to use the RAK software found here:
https://downloads.rakwireless.com/LoRa/RAK2245-Pi-HAT/Firmware/RAK2245_Latest_Firmware.zip
Using this I seem to get a similar problem, although a different error message
ERROR: [main] failed to start the concentrator
My current thoughts are that the problem may be with the concentrator not resetting properly. I have looked at the following thread: IMST Lite Gateway setup
One of the remedies that @brocarr reccoended was:
Reset the sx1301:
raspberrypi:/home/admin# /etc/init.d/sx1301-reset stop && /etc/init.d/sx1301-reset start
Unforutuately, /etc/init.d/sx1301 does not exist.