Hi yadav_jitendra80,
The error that you are seeing in #1 is due to the URL link being an HTML file. For a YAP application to load correctly, several POST parameters need to be loaded in the application canvas. Because of this, the file that you are linking to needs to be a server-side file as opposed to an HTML page (.php / .asp / etc.)
For #2, there is no direct setting available for viewing the canvas view directly (with the exception of loading the URL itself). This used to be a feature in our old dashboard but was removed - I will be filing an enhancement request to have the button re-added.
I hope that helps.
Jonathan LeBlanc
Technology Evangelist
Yahoo! Developer Network
Twitter:
jcleblanc