Global site search - white page result

Hi support team,

as I try to use your global site search plugin, there a white page comes up by trying to use your widget.

Find here the Link Url
http://gamma.worldcheckin.com/site-search?phrase=forum

and the results screen shots:
http://screencast.com/t/4M41WmxYj
http://screencast.com/t/ZUgxXyvN

Please advice.

Kind regards, Alex