I am having this same issue, any help would be appreciated, I've tried everything in this thread.
For me: Modloader+Forge+AudioMod+GuiAPI + TMI + IC2 = When i open my inventory I get
QuoteDisplay More[IC2] EnergyNet.getForWorld: world = null, bad things may happen..
java.lang.NullPointerException
at ic2.common.TileEntityReactorChamber.onCreated(TileEntityReactorChambe
r.java:33)
at ic2.common.TileEntityReactorChamber$1.tickCallback(TileEntityReactorC
hamber.java:22)
at mod_IC2.OnTickInGame(mod_IC2.java:1377)
at ic2.platform.Ic2.onTickInGame(Ic2.java:347)
at ModLoader.onTick(ModLoader.java:1102)
at EntityRendererProxy.b(EntityRendererProxy.java:22)
at net.minecraft.client.Minecraft.x(Minecraft.java:869)
at net.minecraft.client.Minecraft.run(Minecraft.java:747)
at java.lang.Thread.run(Unknown Source)
Stopping!
Likewise: Modloader+Fordge+AudioMod+GuiMod + CodeChickenCore + Not enough Items + IC2 = the same exact error as above but get it as soon as the world loads.
Mod versions are as follows:
ModLoader 1.2.5
mod_MinecraftForge 3.1.3.105 (also tried .99 and .94)
AudioMod 1.2.5
GuiAPI 0.14.2-1.2.5
mod_TooManyItems 1.2.5 2012-04-13
CodeChickenCore-Client 0.5.2
Not enough Items 1.2.2
IC2 1.95b (even though modloader lists at 1.95? I've double checked, md5 of 1.95b matches the IC2 i have installed)
By the way this all done on a brand new world created each time i switch out a mod.
I've tried from a fresh-postdeleted bin, TMI and NEI work when IC2 is removed. :<