The application "OmniPresenceLauncher" is not open anymore

I have two Macs - an iMac (Catalina) and an MBP (BigSur). Both run OmniFocus all the time and OmniOutliner and OmniGraffle occasionally.

Whenever I restart the MBP (and just the MBP) I get the message “The application “OmniPresenceLauncher” is not open anymore” in a small Finder message window.

This has no impact on anything, the OmniPresence cloud in the status bar is alive and well, and everything is in sync.

But it is annoying!!

Anyone have any clues?