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Me and my friend started a server using Better Minecraft and added about 10 mods on top of it. Everything works fine until we hover over any armor item in the game. Doesnt matter what mod its from it just crashes. We can hover over armor in JEI but it just gives us a tooltip error.
Here is my crash message after hovering over armor
The game crashed whilst rendering screen Error: java.lang.NullPointerException: Registry Object not present: feathers:lightweight
Here is my Crash Report