Following a tutorial on making 2D games in Unreal and ran into a problem. I got the Input Mapping Context set up, but when I try to save it, I keep getting things like “There cannot be a Null Input on a Key Mapping” or “There cannot be a Null Trigger on a Key Mapping”. This is the tutorial I’m using: https://youtu.be/QVxK2dPJr4g?feature=shared
It throws that error when running into a nullptr in the modifier/trigger array during validation in the editor. Go into your Input Mapping Context, check that you dont have any extra zombie triggers and modifiers.
That was exactly it for me. Triggers were collapsed and I didn’t notice an input had 1. I must have accidentally clicked it. Deleted it and the error went away.
