HyperConomy Error

14:00:03 [SEVERE] Error occurred while enabling HyperConomy v0.956 (Is it up to date?)
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(Unknown Source)
        at regalowl.hyperconomy.LanguageFile.buildHashMap(LanguageFile.java:84)
        at regalowl.hyperconomy.LanguageFile.buildLanguageFile(LanguageFile.java:50)
        at regalowl.hyperconomy.LanguageFile.<init>(LanguageFile.java:21)
        at regalowl.hyperconomy.HyperConomy.initialize(HyperConomy.java:88)
        at regalowl.hyperconomy.HyperConomy.onEnable(HyperConomy.java:59)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:374)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:270)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:252)
        at net.minecraft.server.MinecraftServer.j(MinecraftServer.java:320)
        at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:299)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:258)
        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:147)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:398)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)