rankuponkills error 1.5.1

2013-04-01 17:03:40 [INFO] [RankupOnKills] Enabling RankupOnKills v2.0
2013-04-01 17:03:40 [SEVERE] Error occurred while enabling RankupOnKills v2.0 (Is it up to date?)
java.lang.NullPointerException
	at net.roguedraco.rankuponkills.Ranks.loadRanks(Ranks.java:66)
	at net.roguedraco.rankuponkills.RankupOnKillsPlugin.onEnable(RankupOnKillsPlugin.java:94)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_5_R2.CraftServer.loadPlugin(CraftServer.java:282)
	at org.bukkit.craftbukkit.v1_5_R2.CraftServer.enablePlugins(CraftServer.java:264)
	at net.minecraft.server.v1_5_R2.MinecraftServer.j(MinecraftServer.java:301)
	at net.minecraft.server.v1_5_R2.MinecraftServer.e(MinecraftServer.java:280)
	at net.minecraft.server.v1_5_R2.MinecraftServer.a(MinecraftServer.java:240)
	at net.minecraft.server.v1_5_R2.DedicatedServer.init(DedicatedServer.java:150)
	at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:379)
	at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)