devices not showing up in dropdown box

[atjshop]

Thanks for the node-red node. I'm have difficult setting up.
I've followed steps in https://docs.cb-net.co.uk/en/development/getting-started.html
When I added a node to the flow, the devices dropdown box doesn't show any devices (clicked refresh already), screenshot posted below. How do I troubleshoot and fix this? Thanks!

config node