"There is no Application set to open the URL"

i just got Rapidweaver 7…and for some reason it gives me this message when publishing….“There is no Application set to open the URL”….this does not hapen in rapidweaver 6….any suggestions?
Thanks
Francisco

A bit of Googling suggests it may be a Safari-related problem?

https://productforums.google.com/forum/#!topic/youtube/PsdcZJMFZOg