You have not explicitly specified the type of reverse-proxy you'd like to use (with a `matrix_playbook_reverse_proxy_type` variable in your configuration).
The playbook used to default to nginx (matrix-nginx-proxy), but things are changing with Traefik being the new default reverse-proxy.
Error:
New installations will now default to Traefik as their reverse-proxy.
To fix the error you need to add the following to
vars.yml
Best to update the README instructions