Lobby Plugin BUG

[16:25:26] [Server thread/INFO]: NebelJonton issued server command: /lb
[16:25:26] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'lb' in plugin Lobby v1.1.1
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_66]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_66]
    at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]
Caused by: java.lang.NullPointerException
    at me.BukkitPVP.Lobby.Language.Messages.msg(Messages.java:21) ~[?:?]
    at me.BukkitPVP.Lobby.Module.LobbyAPI.fix(LobbyAPI.java:450) ~[?:?]
    at me.BukkitPVP.Lobby.Module.LobbyAPI.reset(LobbyAPI.java:300) ~[?:?]
    at me.BukkitPVP.Lobby.Events.LobbyEnterEvent.<init>(LobbyEnterEvent.java:26) ~[?:?]
    at me.BukkitPVP.Lobby.Commands.LobbyCMD.onCommand(LobbyCMD.java:42) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot-1.8.8.jar:git-Spigot-db6de12-d3e0b6f]
    ... 15 more