Opening yelp deep link from android app -

i using following code , not opening yelp app:

    string uristring = "yelp://biz/" + "some name";      startactivity(new intent(intent.action_view, uri.parse(uristring)));  

instead says

could not execute method of activity !

any pointers?

the answer being, call http url of yelp page, ask whether open in yelp app if pre-installed. else , open in browser.