Date Picker Not Working

Getting this error:

Uncaught TypeError: Cannot read property 'fadeIn' of undefined jquery.ui.datepicker.min.js:5
$.extend._showDatepicker jquery.ui.datepicker.min.js:5
v.event.dispatch jquery.js:2
o.handle.u

It appears to be a theme conflict as it worked fine with twentytwelve theme. Any ideas to fix?

also using jquery “1.8.3”

Thanks

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