java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at Reika.RotaryCraft.Registry.MachineRegistry.getMachine(MachineRegistry.java:493)
at Reika.RotaryCraft.TileEntities.Transmission.TileEntityClutch.transferPower(TileEntityClutch.java:49)
at Reika.RotaryCraft.TileEntities.Transmission.TileEntityClutch.transferPower(TileEntityClutch.java:100)
at Reika.RotaryCraft.TileEntities.Transmission.TileEntityClutch.updateEntity(TileEntityClutch.java:36)
at Reika.DragonAPI.Base.TileEntityBase.func_145845_h(TileEntityBase.java:465)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2006)
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(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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