Eu vi esse mesmo comportamento após desinstalar o Server.app. Acredito que o consertei fazendo o seguinte:
sudo launchctl unload /System/Library/LaunchDaemons/com.apple.emond.plist
# remove the Server.app paths from the additionalRulesPaths array
sudo vi /etc/emond.d/emond.plist
sudo rm /var/db/emondClients/com.apple.server
sudo launchctl load /System/Library/LaunchDaemons/com.apple.emond.plist