Server Tick Loop Error

Description: Exception in server tick loop

java.lang.NoSuchMethodError: net.minecraft.util.ChatComponentStyle.func_150254_d()Ljava/lang/String;
	at com.azewilous.ranks.BattleHandler.battleEnded(BattleHandler.java:36)
	at cpw.mods.fml.common.eventhandler.ASMEventHandler_24_BattleHandler_battleEnded_PlayerBattleEndedEvent.invoke(.dynamic)
	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.endBattle(BattleControllerBase.java:317)
	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.checkPokemon(BattleControllerBase.java:427)
	at com.pixelmonmod.pixelmon.battles.controller.BattleControllerBase.update(BattleControllerBase.java:209)
	at com.pixelmonmod.pixelmon.battles.BattleRegistry.updateBattles(BattleRegistry.java:68)
	at com.pixelmonmod.pixelmon.battles.BattleTickHandler.tickStart(BattleTickHandler.java:12)
	at cpw.mods.fml.common.eventhandler.ASMEventHandler_21_BattleTickHandler_tickStart_WorldTickEvent.invoke(.dynamic)
	at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
	at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
	at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:260)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:963)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
	at java.lang.Thread.run(Unknown Source)