I found out that it has to do with my Levels. Exactly when i Create a UI Widget but just when i use the my MainMenuWidget. But i can open the Widget in the Editor. When i create something new and compile it i also get the error
I found out that it has to do with my Levels. Exactly when i Create a UI Widget but just when i use the my MainMenuWidget. But i can open the Widget in the Editor. When i create something new and compile it i also get the error