CRASH Server Crash

[slick]

---- Minecraft Crash Report ----

// Who set us up the TNT?

 

Time: 4/22/14 10:29 PM

Description: Exception in server tick loop

 

java.lang.ArrayIndexOutOfBoundsException: -1

at java.util.ArrayList.elementData(Unknown Source)

at java.util.ArrayList.get(Unknown Source)

at net.minecraft.server.management.ServerConfigurationManager.func_72374_b(ServerConfigurationManager.java:1125)

at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:918)

at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)

at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:781)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:663)

at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)

 

help? This only started when I got bukkit...