java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at Reika.RotaryCraft.RotaryEventManager.onRemoveArmor(RotaryEventManager.java:274)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_462_RotaryEventManager_onRemoveArmor_AddToSlotEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at Reika.DragonAPI.Instantiable.Event.SlotEvent$AddToSlotEvent.fire(SlotEvent.java:45)
at net.minecraft.inventory.Slot.func_75215_d(Slot.java)
at net.minecraft.client.network.NetHandlerPlayClient.func_147241_a(NetHandlerPlayClient.java:1062)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:49)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:11)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1602)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
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:498)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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