FancyMenu error

I have a MultiMC instance which is very full of mods, but then I added Controlify and suddenly, FancyMenu exploded. It spammed almost 5k errors in 2 seconds, and my MultiMC crashed when I closed the window. All that was seen on the window was the Minecraft logo and a blank button. However, when I removed Controlify, it was all normal. I tested this on another Minecraft instance without any other mods, and it worked. I need help in finding the offending mod.

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