but, could see that it is throwing the below error in the first page (home page).
Message: Ext.Loader is not enabled, so dependencies cannot be resolved dynamically. Missing required class: Messages
I've found it helpful to run the app with all-classes.js after the sdk build and then use for example chromes stack trace (drop down on the error message) to show the line which is causing the problem. Once you have the line it probably comes down to doing a require where you didnt need one.