@jagansai Judging by your imports you’re using the Angular 2 RC release which is still not supported by Ionic 2. There are several breaking changes between the Angular 2 release currently used in Ionic 2 beta.6 release (Angular 2.0.0-beta.15) and the Angular 2.0.0-rc1. Check out the linked topic for details:
Here’s the issue that tracks the progress of the remaining work of the upgrade to Angular 2 RC:
I would suggest you to wait for beta.7 if you want to use Angular 2 RC or use the currently supported version of Angular 2 - 2.0.0-beta.15.