Refreshing Scoreboard Bug

I am currently trying to make a scoreboard for a minigame lobby. I am trying to detect to draw a new scoreboard with the countdown clock but I get this errer always! im using new BukkitRunnable() {}
and even the scheduler()

Here is my error.

Code:

[08:02:43 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'pvpp
' in plugin PvpParkour v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:19
6) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.CraftServer.dispatchCommand(CraftServe
r.java:542) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.handleCommand(PlayerCon
nection.java:932) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java
:814) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.a(PacketPlayInChat.java
:28) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.PacketPlayInChat.handle(PacketPlayInChat
.java:47) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craf
tbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
55) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:203) ~[craftbu
kkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.validate(Craf
tScheduler.java:391) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.craftbukkit.v1_7_R1.scheduler.CraftScheduler.runTaskTimer(
CraftScheduler.java:120) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at org.bukkit.scheduler.BukkitRunnable.runTaskTimer(BukkitRunnable.java:
100) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        at Lobby.LobbyScoreboard.refreshHeader(LobbyScoreboard.java:54) ~[?:?]
        at Lobby.LobbyScoreboard.showStats(LobbyScoreboard.java:42) ~[?:?]
        at Lobby.Lobby.joinLobby(Lobby.java:41) ~[?:?]
        at Commands.Commands.onCommand(Commands.java:114) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.2-b2974jnks]
        ... 13 more

 

What's in line 46, PluginCommand?

 

that is 46 in craftbukkit.jar or something not in my plugin.

 

Right man, sry

 

Im thinking about doing maybe a lobby loop that checks and edits all the nessisary things