Bukkit

Hello.

What does this error means? it happens when we get teleported to the spleef arena?

24.08 15:32:14 [Server] INFO at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:600) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) [craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftTask.run(CraftTask.java:53) ~[craftbukkit-1.7.9-R0.2.jar:git-Bukkit-1.7.9-R0.1-10-g8688bd4-b3092jnks]
24.08 15:32:14 [Server] INFO at uk.co.live.karlfish.plugin_DolphinSpleef$1.run(plugin_DolphinSpleef.java:238) ~[?:?]
24.08 15:32:14 [Server] INFO at uk.co.live.karlfish.plugin_DolphinSpleef.timeToString(plugin_DolphinSpleef.java:579) ~[?:?]
24.08 15:32:14 [Server] INFO at java.lang.String.substring(Unknown Source) ~[?:1.8.0_05]
24.08 15:32:14 [Server] INFO java.lang.StringIndexOutOfBoundsException: String index out of range: -2

Unfortunately, I've given up on fixing it due to the inefficient code. I'll be working on a re-make within the next week or two. I'd suggest you try another spleef plugin (Super Spleef or HeavySpleef). Sorry for wasting your time