Chromecast Session not Starting

chrome.cast.requestSession(onRequestSessionSuccess, onLaunchError);

I am sending an HD image url to cast it on TV. When calling createSession method it leads to the failure callback that is onLaunchError() in above code.

Initialization of the cast with chrome.cast.initialize() method gives a success response. That means the cast is loaded but it does not create the session which I required to send and image URL to TV.

Please lead.

Thanks.