Adsense ad not showing up

Hi,
I love this plugin lot but the plugin has suddenly stopped showing up any ad on my site http://reviewshots.com

While, you won’t be able to see the ads on the site, you can still view the ad on a 404 error page. example, http://reviewshots.com/asdf

Can’t figure out the issue. I tried deactivating the plugin and then reactivate but it still is a big issue for me to show ads. so far no success.. please help..

https://wordpress.org/plugins/html-javascript-adder/