Startup Error

19:39:50 [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(RankupOnKil
lsPlugin.java:93)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:365)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:265)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:247
)
        at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:296)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:275)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:225)
        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:378)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)