Thank you very much, that resolved the problem!
I uninstalled AppVerifier and assumed it would also clear the list, but once I installed it again, my application was still in its list.
Once I removed the application, saved the setting and recompiled my software (to make sure) the error message vanished.
@Th69 , @Quiche-Lorraine
Thank you for the quick answers that narrowed down my problem so efficiently!