Working now, It was indeed set to 30005. Set to 320 works fine now.
Also, if this addon requires docker, then it should be downloaded as a dependencey for this addon.
Thanks!
Awesomeness
I am glad the addon works for you now.
The problem obviously lies in the transition from preview release 90 to a later release, as already reported by Dom4Jack in the other thread.
I will update the first post to instruct uninstalling preview release 90 before installing release 100 or later.
This addon does not require Docker, yet, but that may change in the future.
Thank you for your feedback