Controlling GX IO Extender 150 via NodeRed

Hello Victron people, I'm completely new to the community. I started working in Node Red under OS VENUS LARGE. The Victron palette doesn't want to communicate with me yet, does anyone have any experience? Thank you

When you have the victron module installed, search for the switch node. The extender relays do not show up in the relay node

Jan, thank you for your response. But all Victron nodes 
report to me: Unable to access the service 
endpoint:/victron/services/input-switch.