Upgrade ionic2 beta.2 - got error

After upgradeing to beta.2. My application does not run anymore. I get following error in brwoser

Uncaught Error: Cannot find module “…/project/app/app”

Please checkout some of the recent changes. We’ve changed the build structure recently and that comes with a new ionic CLI, so make sure you upgrade the CLI as well.

npm install -g ionic@beta