Catch_that_image not working for me.

I am using a theme called Hyperspace found over at http://www.ufothemes.com/themes/

The site I am working on is http://www.theklean.com

My problem is that the theme doesn’t have an option to display just one photo in the preview. It’s either the entire post with all the photos or none at all. I found that a lot of people use catch_that_image to solve this problem but I can’t seem to get it to work. I have found quite a few post that describe how install it, but no matter what I keep getting error warnings, or it simply doesn’t work. I don’t know if there is something in the theme that is stopping it from working, or I’m just doing it wrong.

Any help or insight to this would be greatly appreciated.