I'm following the tutorial to create a dashboard fo the new backoffice and I'm getting this error on VS when I try to include the App_Plugins folder in the project. Any ideas about how to fix it?

That's a long path name. Could it be a path name issue perhaps? I also don't really expect to see a node modules folder inside app_plugins. Perhaps it's worth moving your node modules outside of the app_plugins

Check this article https://www.andybutland.dev/2023/09/umbraco-14-package-migration-installing.html Hope not all sites require a Registry update

thanks. It turns out thast I was including node_modules in the VS project. Don't do that 😉