does the program continue to work? i have had this occasionally and the program continued to work after a save. does your RB stop working? is there any common 'trigger' that causes the message?

have you tried a return to factory settings?

from your other posts you seem to be familiar with other DAWs - maybe using the BIAB plugin in another DAW may suit you better as a workflow although most of us don't have your problems with RB.

if you tell us a bit more about your set up there are so many experts here who can help.