Facebook tab not working

Question

I made a facebook canvas application -

Canvas Page http://apps.facebook.com/mybuzzrapplication
Canvas URL http://174.132.194.155/~kunal17/devbuzzr/facebook/
Canvas Type IFrame

I also added a tab to it -

Tab Name  Deals
Tab URL      http://apps.facebook.com/mybuzzrapplication/

Now this canvas page is working fine the base url is working fine but when i added the Deals tab on my fan page it shows me following -

Application Temporarily Unavailable
The URL http://174.132.194.155/~kunal17/devbuzzr/facebook/ returned a 404 Not Found error.

Can anyone give me some hints about this??? Thanks in advance for your help.