Blue Box without Message showing instead of UI

Hello everyone,
I am running into this strange error where a blue box without any message just an “Okay” and “Cancel” Button is showing up instead of my custom ui (programmed in Verse).

When I press either one of the two buttons the box disapears.
Never had this before and my ui worked in other projects.
Thanks in advance for every tipp.

When I click on either one of the two buttons the box goes away and my UI is showing as it should…

Fixed itself … these are the problems we need