AdSense ad serving has been disabled on my site.. what should I do now?

Hi,
I have a wordpress article directory which is active now and adsense were working from more than a month.
but from yesterday adsense disabled from my site and Google sent me an email:

Please take a look at the screenshot and let me know what's going wrong and what should I do now?

Thanks for your help.

 

I think you put adsense add in sensitive places in web site. It may be a reason.