Hello
I was having a similar issue after a restart of my NAS on which I was running my HA in a VM.
I tried everything; even setting up a new VM with a blank installation.
I would get the exact same issue!
So randomly saw somewhere that when you get that error, its due to some timeout.
It said to wait a little while (few mins) then type “banner”
ha > banner
Then it should refresh and should work.
Really stupid, something has clearly happened in the recently updated because this has never occurred before. Not sure if running this in a VM is too niche for the developers to test this sort of thing.