Updating to beta.9 - 'registerBackButtonAction' of undefined

Updated to the newest beta(.9) and running into this issue when running ionic serve

Anyone successfully updated yet?

** Only change I made was in package.json to update "ionic-angular": "^2.0.0-beta.9", - from .7. Deleted the NPM modules folder, and ran npm install. Everything went fine with no dependency issues. **

Made a few more changes in the package.json - minor version upgrades, as compared to a brand new ionic build. Still not working.

Fixed. Had to:

in app.ts

import {Component} from '@angular/core';
import {Platform, ionicBootstrap} from 'ionic-angular';

// change @app to @component