Error AGAIN!

java.lang.NullPointerException
at um.a(SourceFile:28)
at tw.a(RenderItem.java:103)
at tw.a(RenderItem.java:513)
at ahu.a(ahu.java:149)
at ws.a(SourceFile:64)
at cw.b(EffectRenderer.java:192)
at lr.a(EntityRenderer.java:1141)
at lr.b(EntityRenderer.java:952)
at EntityRendererProxy.b(EntityRendererProxy.java:21)
at net.minecraft.client.Minecraft.x(SourceFile:752)
at net.minecraft.client.Minecraft.run(SourceFile:671)
at java.lang.Thread.run(Unknown Source)
Stopping!

SoundSystem shutting down...
Author: Paul Lamb, www.paulscode.com