Ionic serve not working

ionic info

Your system information:

Cordova CLI: 6.2.0
Gulp version: CLI version 3.9.1
Gulp local:
Ionic CLI Version: 2.0.0-beta.31
Ionic App Lib Version: 2.0.0-beta.17
OS:
Node Version: v5.11.0

can anyone please help me out of this.
i also tried
npm install -g ionic@beta
like 2-3 times

still not able to solve the issue

I have same problem, managed to solve?

If you’re using typescript, app.bundle.js might not be generated if you have transpiling issues.

yup…i solved it.
i had issue with my code …after updating the code according to the breaking changes , ionic serve worked like charm.

to check the braking changes introduced in ionic check this link change your code.(better create a new project and copy paste your code from app folder and implement breaking changes)