Failed to get custom node list

I dragged a Jason file into the UI and it loaded the workflow, indicating several nodes that needed installing as expected. I opened the Manager and chose Install Missing Nodes and got a message in red text… Failed to get custom node list. I’m running V0.3.75 and have auto install updates set in the app. Some of my other workflows with custom nodes are also flagged as missing (red outline). This is as of 14:23 local time (UK) 30th Nov 2025.