Seeing these errors a lot. What do they mean? And is there a place where I could look up what those error codes mean myself?

the meaning of the topic numbers can be found here:
https://github.com/spring/spring/blob/d ... ISEvents.h

the meaning of the error is a harder thing. the error coudl happen in the native part of the ai interface (if AI is Java:, the java part, the OO wrapper) or the AI itsself.

most likely, you are throwing exceptions or other throwables in your event handling code. simply try to catch them.

Thanks, that helped me narrow it down. Apparently every frame I was trying to access a List<Unit> that hadn't been initialized yet. I guess I was expecting a null reference exception.