I currently have the issue where the IDE throws this error:

One or more duplicate file names were detected. All image output filenames must be unique: appicon (C:\Users\Username\Documents\Abschlussprojekt HealthNotifier\HealthNotifier\HealthNotifier\Resources\AppIcon\appicon.svg)

but there are no files with the same name, and I was not able to find the source of this problem.

My solution Explorer: