Hmmm okay. It sounds like there’s a bigger issue going on here. You shouldn’t be getting errors with the Set Color Scale Offset node if you have the OculusVR plugin enabled. I see in the first screenshot you posted you’re getting errors when trying to load the OculusFunctionLibrary, most of these problems seem to be caused by the OculusVR plugin - please can you right-click and search in the blueprint for the Oculus Library, let me know if you get any options like these:
For the gun reloading issues - please can you try to compile BP_Sniper and BP_Handgun, these both have additional code added for reloading so there may be errors inside these blueprints preventing you from pulling back the bolt/slide
Also go to Pawn>Mannequin>Animations and open RightHand_AnimBP, compile it and check for errors as this blueprint handles switching the blendspace animations for the hand