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I tried to join my friends world on the greenfield map with the same mods as him, same versions Custom NPCS 1.7.10, Crayfish Furniture mod 1.7.10, and Bibilocraft 1.7.10. I can join the game for a second then crash. We both have fast computers that both can withstand greenfield one being a mac, and the other pc. All I added to the world was a custom NPC. Tell me if you need more information. Thanks!

java.lang.IndexOutOfBoundsException
at java.nio.Buffer.checkIndex(Buffer.java:512)
at java.nio.DirectIntBufferU.get(DirectIntBufferU.java:248)
at net.minecraft.client.renderer.RenderGlobal.func_72712_a(RenderGlobal.java:350)
at net.minecraft.client.renderer.RenderGlobal.func_72732_a(RenderGlobal.java:294)
at net.minecraft.client.Minecraft.func_71353_a(Minecraft.java:2204)
at net.minecraft.client.Minecraft.func_71403_a(Minecraft.java:2134)
at net.minecraft.client.network.NetHandlerPlayClient.func_147282_a(NetHandlerPlayClient.java:239)
at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:70)
at net.minecraft.network.play.server.S01PacketJoinGame.func_148833_a(SourceFile:13)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(SourceFile:78)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1649)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:961)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)