The solution seems to pertain to a file located server side, meaning that you are using adsense on a server that you had set up, or on a website that you host, in your hosted files there needs to be 'robot.txt' in order for the google adsense crawler bot to function. In order for this to work, you need to allow the adsense bot to run on the server. You do this by finding the 'robot.txt' file which is located on your server's root directory. example: www.yourdomain.com/robot.txt
You edit the file, and add this to the top:
User-agent: Mediapartners-Google
Disallow:


