Cast failed for no reason

Hello,

I updated my project from 4.13 to 4.16 successfully, but my casts failed everytime for no reason.
I want to cast with my character blueprint to the gameinstance or somethingelse and it failed everytime.
In my 4.13 it worked fine.

Below you see a cast for example.

Does somebody knows what it could be?

Greetings

Hello Shmann,

Did you make sure that your game instance is still selected in the project settings under Maps & Modes?