Problem z głową gracza

ItemStack skull = new ItemStack(Material.SKULL, 1);
SkullMeta skullMeta = (SkullMeta) skull.getItemMeta();
skull.setDurability((short) 3);
skullMeta.setDisplayName(ChatUtil.fixColor("&a&oTopki serwera - Sprawdz kto jest najlepszy!"));
skullMeta.setLore(Arrays.asList("§8» §2§oNacisnij, aby przeniesc sie do topek ", "§8» §2§oW topkach znajduje sie ", "§8» §2§oNajlepsi gracze serwera ", "§8» §2§oPodbij topki! Pokaz, kto tuje rzadzi!"));
skull.setItemMeta(skullMeta);

Błąd:
 

org.bukkit.command.CommandException: Unhandled exception executing command 'pomoc' in plugin VCORE v0.2
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_181]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_181]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [Spigot.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_8_R3.inventory.CraftMetaItem cannot be cast to org.bukkit.inventory.meta.SkullMeta
        at pl.verdun.tools.commands.PomocCommand.onCommand(PomocCommand.java:56) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Spigot.jar:git-Spigot-21fe707-e1ebe52]
        ... 15 more