If you manually validate your account (from within the ad network interface), it will tell you specifically what page it was not able to find ads on when you run it.
Please do not ask if ads need to be on that page, because they do (the ad network for the most part is for site-wide ads).
If you need help *getting* the ads there, please give as much info as possible... the URL, what type of setup/scripting language you are using, etc.