Running 'serve:before' gulp task before serve


Hi guys, okay?
I am new to the ionic 2’ve been researching on the error, but did not find anything clear, when I start a server it returns me this, how do I fix?

`$ ionic serve --address localhost --port 6100

Running ‘serve:before’ gulp task before serve
[19:01:10] Starting ‘clean’…
[19:01:10] Finished ‘clean’ after 159 ms
[19:01:10] Starting ‘watch’…
[19:01:10] Starting ‘sass’…
[19:01:10] Starting ‘html’…
[19:01:10] Starting ‘fonts’…
[19:01:10] Starting ‘scripts’…
[19:01:11] Finished ‘html’ after 379 ms
[19:01:11] Finished ‘scripts’ after 409 ms
[19:01:11] Finished ‘fonts’ after 1.03 s
[19:01:17] Finished ‘sass’ after 6.21 s
7.7 MB bytes written (85.12 seconds)
7.7 MB bytes written (16.83 seconds)
[19:03:02] Finished ‘watch’ after 1.85 min
[19:03:02] Starting ‘serve:before’…
[19:03:02] Finished ‘serve:before’ after 16 μs

Running live reload server: undefined
Watching: 0=www//*, 1=!www/lib//*
√ Running dev server: http://localhost:6100
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

$ ionic info

Your system information:

Cordova CLI: 6.1.1
Ionic Version: 2.0.0-beta.4
Ionic CLI Version: 2.0.0-beta.22
Ionic App Lib Version: 2.0.0-beta.12
OS: Windows 7 SP1
Node Version: v4.4.3`