Unexpected Error from Flows that previously worked and still work on all other Node-Red Platforms

[4302dam]

A while back I installed Node-red desktop (same version) and imported my flows. Worked fine but had an issue with getting the file menu to appear so I could save the flow. (I didn't know about the Alt key). So I uninstalled and reinstalled the same version and imported the flow again. (same notepad file). Now I can neither save nor deploy. I get the following error (screenshot attached) "Deployment failed: {"code":"unexpected_error","message": "cannot read properties of null (reading "rev")}
I have tied importing the flows in small pieces to see if I can find which node has a problem. Doesn't appear to matter. Whatever I import I get this error. Anyone have any ideas? Thank you.
nodered error.pdf