THIS PLUGIN ADD A COUPLE OF PLACEHOLDERS TO THE FREE VERSION OF KITBATTLE WHICH HAS BEEN ABANDONED BY THE ORIGINAL AUTHOR AND UNLIKELY WILL BE ADDED PLACEHOLDERS IN THE PLUGIN ITSELF

PLACEHOLDERS LIST

• kit-battle_kills
• kit-battle_deaths
• kit-battle_xp
• kit-battle_nextxp
• kit-battle_kit
• kit-battle_rank
• kit-battle_unlockedkits
• kit-battle_lockedkits
• kit-battle_allkits
• kit-battle_killstreak
• kit-battle_tokens

THE PLACEHOLDERS ARE FOR THIS PLUGIN: https://dev.bukkit.org/projects/kitbattle

So you need that plugin and placeholderapi installed to use this plugin.