error

[13:13:27 INFO]: ServerBad issued server command: /bb join
[13:13:27 INFO]: [BuildBattlePro] Player stats for player ServerBad created !
[13:13:27 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing 'bb join' in
me.drawe.buildbattle.commands.BBCommand(buildbattle)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:15
5) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServe
r.java:666) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerCon
nection.java:1189) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java
:1001) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:45) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java
:1) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:1
3) [patched.jar:git-PaperSpigot-"4c7641d"]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [
?:1.8.0_221]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_221]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [patched.ja
r:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:7
74) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:3
78) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:7
13) [patched.jar:git-PaperSpigot-"4c7641d"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java
:616) [patched.jar:git-PaperSpigot-"4c7641d"]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_221]
Caused by: org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to r
egister task while disabled
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.validate(Craf
tScheduler.java:407) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.runTaskTimer(
CraftScheduler.java:126) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at org.bukkit.scheduler.BukkitRunnable.runTaskTimer(BukkitRunnable.java:
100) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        at me.drawe.buildbattle.objects.bbobjects.arena.BBArena.startLobby(BBAre
na.java:329) ~[?:?]
        at me.drawe.buildbattle.objects.bbobjects.arena.BBArena.addPlayer(BBAren
a.java:160) ~[?:?]
        at me.drawe.buildbattle.commands.subcommands.arena.BBJoinSubCommand.exec
ute(BBJoinSubCommand.java:71) ~[?:?]
        at me.drawe.buildbattle.commands.BBCommand.execute(BBCommand.java:78) ~[
?:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:14
6) ~[patched.jar:git-PaperSpigot-"4c7641d"]
        ... 14 more
>