How to cancel a repeating task

Hello,

I'm using a repeating task, like so: https://gist.github.com/9abe714b40a63fbcf710

But I'm having a problem whereby the "explosion" continues to occur every second, even after I cancel the task, and I get this error in console: http://pastebin.com/H3C8VRSc

Any help would be appreciated! Thanks!

 

its because you cancelling it for each player that is online. After cancelling it, do 'break;'

 

Done, but I still get this error:
java.lang.IllegalStateException: Not scheduled yet
at org.bukkit.scheduler.BukkitRunnable.getTaskId(BukkitRunnable.java:128)
at com.github.thoosequa.atmony.listener.ShipBattleItems$1.run(ShipBattleItems.java:51)
at org.bukkit.craftbukkit.scheduler.CraftTask.run(CraftTask.java:53)
at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:529)
at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)

(and the explosions still continue)

EDIT by Moderator: merged posts, please use the edit button instead of double posting.