The method player.launchProjectile() gives the following Exception when trying to launch a LlamaSpit:

[18:24:20] [Server thread/ERROR]: null

org.bukkit.command.CommandException: Unhandled exception executing command 'bc' in plugin blockcmds v0.0.1-SNAPSHOT-bUNKNOWN
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at org.bukkit.craftbukkit.v1_11_R1.CraftServer.dispatchCommand(CraftServer.java:650) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.PlayerConnection.handleCommand(PlayerConnection.java:1344) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:1179) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_121]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_121]
at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_121]
Caused by: java.lang.IllegalArgumentException: Projectile not supported
at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at org.bukkit.craftbukkit.v1_11_R1.entity.CraftLivingEntity.launchProjectile(CraftLivingEntity.java:399) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
at me.andablock.blockcmds.commands.Shoot.executePlayer(Shoot.java:29) ~[?:?]
at me.andablock.blockcmds.utils.BasicCommand.execute(BasicCommand.java:75) ~[?:?]
at me.andablock.blockcmds.Commands.onCommand(Commands.java:54) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.11.2.jar:git-Spigot-b4417b8-3c48711]
... 15 more