@Sujan12 I just follow Ionic2 to Ionic3 link and updates my code according to that. and its working fine.
Before that i uninstall ionic v2.2.0 and run npm install ionic cordova -g and also update node and npm version.
It’s update ionic, ionic cli, app-script and cordova globally in my system.
Thank you @Sujan12, @reedrichards and @fdom.
I am too much happy 
but still worrying about 13 seconds 
I am going to follow Lazy Loading link. Should I do it or not? And if I do it what will be the benifit of it? If you have any other link or resources to achieve lazy loading for the quick boot time?
Please help me out in this issue as I am stuck since long. Thanks a lot.