Ionic serve problem with gulp

When I try to call ionic serve, there are no any started gulp tasks, It looks like this:

Running live reload server: http://localhost:35729
Watching: …/…/…/public/application/**/, !../…/…/public/application/chcp., !../…/…/public/application/*.map
√ Running dev server: http://localhost:8100
Ionic server commands, enter:
restart or r to restart the client app from the root
goto or g and a url to have the app navigate to the given url
consolelogs or c to enable/disable console log output
serverlogs or s to enable/disable server log output
quit or q to shutdown the server and exit

My ionic version is: 2.1.0

This trouble happened when I updated ionic to 2.1.0
Also these hooks don’t work: before_serve, after_serve

In this version of Ionic 2.1.0 Gulp was replaced by rollup. Introduced with Ionic RC0.