Feature Slider Thumbnail not appearing

Feature Slider Thumbnail not appearing on Wordpress site.

see this screenshot - http://i.imgur.com/48GBR.jpg

Current version - timthumb.php 2.8.10

Any way for fix this trouble? help me please

Site - thisisf1.com

probably it its image src is not getting thumbnail's file path, the current value is http://thisisf1.com/wp-content/theme...ured_small.jpg

it has to be changed to required with file path.

can't tell you what/where to edit without looking at your code.