The app is not loading in an iframe, It seems blank totally


I've created one app and its flow goes like, 

And my,

App URL:

App HomePage:



(1) Installation step goes using install.php

(2) Billing Screen will appear.

(3) Redirecting to app HomePage.php


-> Above steps are working properly but the problem is starting now 

♦ When I click Apps/MyawesomeApp it will give me blank screen in the iframe.

♦ I got the issue. This is happening by install.php because it has only installation code, not my HomePage code

That's why whenever I click on my app it gives me a blank screen. Please give me a proper solution.