Random error on startup

Cubase error 2
getting this message at random times. One day opens fine next day error. Have installed the latest USB e license. Tried different ports for the USB dongle. I posted about this back in December but in the wrong forum so I thought I’d try again.
Cubase Artist 10.5.20 Windows 10 pro 64bit I7 16 gig ram, 500 gig SSD + outboard harddrive.

rev-x plugins come with the UR interfaces - are you running one of those ?

Yes, I have UR 28M.