I am looking to find some help on header compiler errors. We are trying to integrate the plugin at the engine level of UE4 (not the project level) and we get these errors - “Expected PopcornFXFileName.h to be first header included”. I used PopcornFXFileName because there are way too many to list here. What does it mean to have all the .h files to be the first header included? Any help would be greatly appreciated.