Robot does not recognize published projects

Since today, my robot doesn’t recognize my published projects anymore. It says “No processes available” in the system tray robot application while there are 4 .nupkg files in the right folder (C:\ProgramData\UiPath\Packages). Yesterday all worked fine.

When I try to run the process from Studio I get the following error:

Could not connect to UiPath Robot Service. Make sure the service is started!

Anyone knows what is happening here?