Juju bootstrap issue

So I’ve installed MAAS and created 2 nodes. I have been trying to install Juju on one of the nodes. I add the credentials and cloud but when I try to pass the command:

juju bootstrap --bootstrap-series=focal --constraints tags=juju mymaas maas-controller

I get the error :

ERROR failed to bootstrap model: cannot start bootstrap instance: unexpected: ServerError: 500 internal server error (get() returned more than one Neighbour – it returned 2!)

What does this error mean? And how do I go about finding a solution?