Halion SE error message in Cubase 12 Pro

Hi there,
When I load my Cubase 12 Pro project, I’ve got this error message : “Due to missing busses, Halion could not re-establish the listed connections. Select the busses that should be used instead.” I’ve got still the message if I delete the Halion tracks from my project. Is it a bug ?

Have you already checked the settings in the “Effects” section of Halion? Maybe there are some outputs selected that are no longer available for some reason.
I’d also check if there’s a Halion instance left in the VSTi rack after deleting all Halion tracks.