Dante Via and the Dante Virtual Soundcard cannot run on the same machine at the same time. This error suggests that the Dante Virtual Soundcard is running. It will show up when using old Dante Via version.
Please stop the Dante Virtual Soundcard before starting Dante Via.
If the issue persists, uninstall ALL Dante software and only install Dante Via. Ensure that Dante Via is working as expected and then install other Dante software as required.