java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at net.minecraft.client.audio.PositionedSoundRecord.(SourceFile:30)
at net.minecraft.client.audio.PositionedSoundRecord.(SourceFile:26)
at net.minecraft.client.multiplayer.WorldClient.func_184134_a(WorldClient.java:544)
at net.minecraft.world.World.func_184133_a(World.java:1045)
at com.lothrazar.cyclicmagic.item.itemblock.ItemBlockScaffolding.func_180614_a(ItemBlockScaffolding.java:81)
at undefined.PlayerControllerOF.func_187099_a(PlayerControllerOF.java:88)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1518)
at net.minecraft.client.Minecraft.func_184117_aA(Minecraft.java:2184)
at net.minecraft.client.Minecraft.func_184118_az(Minecraft.java:1961)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1749)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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