Console

[19:47:24] [Server thread/ERROR] [FML]: Encountered an exception while constructing entity 'ri:clucker'
java.lang.InstantiationException: null
	at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(Unknown Source) ~[?:1.8.0_192]
	at java.lang.reflect.Constructor.newInstance(Unknown Source) ~[?:1.8.0_192]
	at net.minecraftforge.fml.common.registry.EntityEntryBuilder$ConstructorFactory.apply(EntityEntryBuilder.java:306) [EntityEntryBuilder$ConstructorFactory.class:?]
	at net.minecraftforge.fml.common.registry.EntityEntryBuilder$ConstructorFactory.apply(EntityEntryBuilder.java:292) [EntityEntryBuilder$ConstructorFactory.class:?]
	at net.minecraftforge.fml.common.registry.EntityEntry.newInstance(EntityEntry.java:68) [EntityEntry.class:?]
	at net.minecraft.entity.EntityList.createEntityByIDFromName(EntityList.java:244) [EntityList.class:?]
	at net.minecraft.item.ItemMonsterPlacer.spawnCreature(ItemMonsterPlacer.java:242) [ItemMonsterPlacer.class:?]
	at net.minecraft.item.ItemMonsterPlacer.onItemUse(ItemMonsterPlacer.java:98) [ItemMonsterPlacer.class:?]
	at net.minecraftforge.common.ForgeHooks.onPlaceItemIntoWorld(ForgeHooks.java:876) [ForgeHooks.class:?]
	at net.minecraft.item.ItemStack.onItemUse(ItemStack.java:200) [ItemStack.class:?]
	at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:507) [PlayerInteractionManager.class:?]
	at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:769) [NetHandlerPlayServer.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:68) [CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(CPacketPlayerTryUseItemOnBlock.java:13) [CPacketPlayerTryUseItemOnBlock.class:?]
	at net.minecraft.network.PacketThreadUtil$1.run(PacketThreadUtil.java:21) [PacketThreadUtil$1.class:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_192]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_192]
	at net.minecraft.util.Util.runTask(Util.java:53) [Util.class:?]
	at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:798) [MinecraftServer.class:?]
	at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743) [MinecraftServer.class:?]
	at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192) [IntegratedServer.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592) [MinecraftServer.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_192]