Forge 41.0.94
SimpleDivingGear-8.0.0+mc+1.19.X

java.lang.NoClassDefFoundError: net/minecraftforge/client/event/RenderGameOverlayEvent$Post
crashlog

Going in reverse alphabetical order of my mods so expect one of these for Actually Useful Stonecutter in a short while.

Don't you just love working with forge?