Hey -
I apologize for missing it before, but with the sample project you provided I now understand what is happening here. I didn’t understand that you are using a plugin and that is what is causing the problem. Plugin files are not included when a hot reload occurs, and the reason you’re getting the error you are is because your GameModeBase.cpp file references your plugin. So when the game hot reloads, that file searches for a compatible hot reload of the plugin which doesn’t exist.