Footer scripts not loading

Hi, I have some validation problems on my form. If I sumbit the empty form it goes to a blank page instead of throwing the error message on the same page. I checked the source code and the footer files, like this visual-form-builder-pro/js/vfb-validation.js?ver=3.5.1′ are missing.

Just updated the plugin. What I should do?

http://wordpress.org/extend/plugins/visual-form-builder/