The error only should show once.
It looks like appending the card id fails.
Check the Info.plist for it.
If it isn't in the list of devices, most likely the file couldn't be written.
Did the tool ask for your password ?
Did you change SIP to allow modifying kexts ?
Also check for a newer version of automate-eGPU.
This version adds the card id to AMDRadeonX4000.kext.
It should add the card id to AMDRadeonX4100.kext for 10.12.3.
There were changes in 10.12.4, so it might have to be added to a different kext.