Error in ionic serve app.ios.scss undefined

I have a problem with ionic serve using 2.0.0-beta17, the application is with v2 and typescript.

When I run ionic serve, the console gives this error.

app\theme\app.ios.scss undefined

before “Sass compilation complete”, I can’t figure it out, I have reinstalled node, cordova and ionic, so I’m asking for some help.

The app work’s well on my other Mac, this is in Windows. And it won’t work for app generated with ionic start either.