Server.log

[WARNING] Unexpected exception while parsing console command "refresh"
org.bukkit.command.CommandException: Unhandled exception executing command 'refresh' in plugin LeveledMobs v1.0
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
	at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchCommand(CraftServer.java:532)
	at org.bukkit.craftbukkit.v1_6_R3.CraftServer.dispatchServerCommand(CraftServer.java:519)
	at net.minecraft.server.v1_6_R3.DedicatedServer.as(DedicatedServer.java:276)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:241)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_6_R3.command.ColouredConsoleSender cannot be cast to org.bukkit.entity.Player
	at maincode.LeveledMobs.onCommand(LeveledMobs.java:88)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
	... 8 more