java.lang.NoSuchMethodError: codechicken.core.CoreUtils.getMaxY(Lfi;)I
        at codechicken.enderchest.ItemEnderChest.a(ItemEnderChest.java:60)
        at jb.a(SourceFile:92)
        at to.a(ItemInWorldManager.java:246)
        at kt.a(NetServerHandler.java:377)
        at ha.a(SourceFile:39)
        at oo.b(SourceFile:272)
        at kt.a(NetServerHandler.java:63)
        at ep.a(SourceFile:108)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:451)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:353)
        at cu.run(SourceFile:457)