i’m having this problem when building the game.
In editor all work fine, but when I run the builded version of the game (no error at all during building process), it crash when still loading with this error message.
I tried with a new blueprint class and an empty C++ class extending AAIController. I receive the same error. After that I tried into an empty project and there all is working fine.
In both project the C++ and the BP class are into an external plugin. For the empty project I created an empty plugin too and i created the empty C++ class inside the plugin.