+1. I've been fighting this for a while and assumed I'd already tried unloading it. I think for me the underlying issue was that the "Program" it references was symlinked to a file in my Dropbox, which moved from ~/Library/Dropbox to ~/Library/CloudStorage/Dropbox. I had to delete and re-created the symlink, so I guess maybe something in the system was referencing an inode or something instead of the path.

@eskimo see my comment above. I didn't file a bug and I don't know if it's related to what other folks are experiencing, but I'm pretty positive the Dropbox change was the cause for me.

Thanks @Frameworks Engineer, this finally got me up and running. I have to say, the CarPlay programming guide is not very helpful here. I started with a SwiftUI app then tried to add CarPlay integration and started down the scene configuration path, but apparently had my CPTemplateApplicationSceneSessionRoleApplication nested as another role under my UIWindowSceneSessionRoleApplication.

FWIW, you also don't need a UIWindowSceneSessionRoleApplication to use a scene configuration for your CarPlay scene. You can just leave the @main annotation on your SwuiftUI App Scene.