Installed the plugin and problem starts

I installed this plugin and there is a problem appeared in my wordpress site. When I click any link under category, my site starts malfunctioning and a strange message appears. I tried to solve this problem again and again but all my attempts ended in smoke. Finally, I deleted the plugin and reinstall wordpress. At last, my problem was solved. I used the plugin for one day. The plugin works well to show ads in posts. But I could not make it to show ads on sidebar. I am afraid to use it once again.