Replace ResourcePack Gui's OpenFolder method to Lambda's FolderUtil to prevent this:
(Translation : Windows cannot find '\D:\USER\Desktop\모음\Minecraft=1.10\마인크래프트\MultiMC\instances\Future & RusherHack & Lambda Travel.minecraft\resourcepacks'. Make sure you typed the name correctly, and then try again.)
WoRkS iN mY cOmPuTeR but be careful with using this because i don't know mixin a lot