Custom Pack Crash

[Aegisix]

at com.enderio.core.common.util.NullHelper.notnull(NullHelper.java:14)
at com.enderio.core.common.util.stackable.IProducer.getItemNN(IProducer.java:26)
at crazypants.enderio.base.item.eggs.RenderEntityOwlEgg.(RenderEntityOwlEgg.java:22)
at crazypants.enderio.base.item.eggs.RenderEntityOwlEgg$Factory.createRenderFor(RenderEntityOwlEgg.java:39)
at net.minecraftforge.fml.client.registry.RenderingRegistry.register(RenderingRegistry.java:77)
at net.minecraftforge.fml.client.registry.RenderingRegistry.loadEntityRenderers(RenderingRegistry.java:70)
at net.minecraft.client.renderer.entity.RenderManager.(RenderManager.java:230)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:517)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:377)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)