Cannot spawn ENDER_PEARL entity.
My plugin uses the following code:

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world.spawnEntity(location, EntityType.ENDER_PEARL);

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but, NullPointerException was trown by this code.

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[01:44:53] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'testp' in plugin TestPlugin v0.0.1-SNAPSHOT
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:140) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at org.bukkit.craftbukkit.v1_8_R1.CraftServer.dispatchCommand(CraftServer.java:624) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.PlayerConnection.handleCommand(PlayerConnection.java:1058) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:919) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:37) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.PacketPlayInChat.a(SourceFile:9) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_40-ea]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_40-ea]
at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:643) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:284) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:598) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:506) [craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_40-ea]
Caused by: java.lang.NullPointerException
at net.minecraft.server.v1_8_R1.EntityProjectile.<init>(EntityProjectile.java:28) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at net.minecraft.server.v1_8_R1.EntityEnderPearl.<init>(EntityEnderPearl.java:12) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.spawn(CraftWorld.java:900) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.spawn(CraftWorld.java:839) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at org.bukkit.craftbukkit.v1_8_R1.CraftWorld.spawnEntity(CraftWorld.java:346) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
at jp.ucchy.TestPlugin.onCommand(TestPlugin.java:219) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[craftbukkit-1.8-R0.1-SNAPSHOT.jar:git-Bukkit-2db3ea2]
... 14 more

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