Persistince with databases, setup

I have been looking around, following some guides and tutorials, though I couldn't find this specific error.

Code:

[INFO] Installing database for Wanted due to first time usage
2011-04-18 16:14:55 [SEVERE] null loading Wanted v1.0.0 (Is it up to date?)
java.lang.NullPointerException
    at org.bukkit.plugin.java.JavaPlugin.installDDL(JavaPlugin.java:251)
    at IcySeal.Wanted.Main.setupDatabase(Main.java:46)
    at IcySeal.Wanted.Main.onEnable(Main.java:86)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:127)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:578)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:216)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:115)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:93)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:215)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:202)
    at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:142)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:257)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:375)
2011-04-18 16:14:55 [INFO] Done (0.131s)!

and line 41-8

Code:

    private void setupDatabase() {
        try {
            getDatabase().find(reportLog.class).findRowCount();
        } catch (PersistenceException ex) {
            System.out.println("Installing database for " + getDescription().getName() + " due to first time usage");
            installDDL();
        }
    }

Help is very much appreciated.

 

I get this when I try Persistence with databases:

Code:

16:14:35 [SEVERE] Could not load 'plugins/DispNameChanger.jar' in folder 'plugins':
java.lang.NoSuchMethodException: me.captain.DispNameChanger.DispNameChanger.<init>()
    at java.lang.Class.getConstructor0(Class.java:2706)
    at java.lang.Class.getConstructor(Class.java:1657)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:135)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:158)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:106)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:84)
    at org.bukkit.craftbukkit.CraftServer.reload(CraftServer.java:285)
    at org.bukkit.command.SimpleCommandMap$ReloadCommand.execute(SimpleCommandMap.java:196)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:80)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:246)
    at net.minecraft.server.MinecraftServer.b(MinecraftServer.java:391)
    at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:377)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:283)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:375)

Idk about your error though...
That part of code is the same for my main class. (i don't know if it is an error though because mine doesn't work anyways.