I have this error pop up when i run lottery plus:
2012-04-09 03:48:28 [INFO] [LotteryPlus] Enabling LotteryPlus v0.6.3
2012-04-09 03:48:28 [INFO] [LotteryPlus v0.6.3] - config loaded.
2012-04-09 03:48:28 [INFO] [LotteryPlus v0.6.3] - lotteries loaded.
2012-04-09 03:48:28 [SEVERE] [LotteryPlus v0.6.3] - no lotteries have been loaded.
2012-04-09 03:48:28 [SEVERE] [LotteryPlus v0.6.3] - An error has ocurred. shutting down...
2012-04-09 03:48:28 [SEVERE] Error occurred while enabling LotteryPlus v0.6.3 (Is it up to date?)
java.lang.NullPointerException
at com.randude14.lotteryplus.Plugin.saveClaims(Plugin.java:263)
at com.randude14.lotteryplus.Plugin.onDisable(Plugin.java:322)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
at com.randude14.lotteryplus.Plugin.abort(Plugin.java:294)
at com.randude14.lotteryplus.Plugin.onEnable(Plugin.java:140)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:336)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:371)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:358)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Do you know how to fix the problem?

I don't see anything about Vault there, you should ask the guy who made LotteryPlus

this is definetely not a Vault issue