After Updating Catalina final, I’m getting this error message. Seems all works fine but DT periodically shows the error. It should happen on program activation or when closed (Cmd-W). 1-5 TB disk space free.
AFAIK, it only happens in my Fusion iMac Drive, as my MacBook Pro (that has about 100 GB free only but has a “pure” SSD disk), does not happen. Could be related to App Store installing updates in background, but not sure.