Error with SCSS

[merolhack]

When i run:
ionic serve --lab

It show me the next errors:

Running 'serve:before' gulp task before serve
[18:21:59] Starting 'sass'...
[18:21:59] Starting 'html'...
[18:21:59] Starting 'fonts'...
[18:21:59] Starting 'scripts'...
[18:22:00] Finished 'html' after 184 ms
node_modules\ionic-angular\components.core.scss
Error: Import directives may not be used within control directives or mixins.
        on line 31 of node_modules/ionic-angular/components.core.scss
>>   @import "fonts/ionicons";
   --^
[18:22:00] Finished 'sass' after 246 ms
[18:22:00] Finished 'scripts' after 230 ms
[18:22:00] Finished 'fonts' after 285 ms
[18:22:00] Starting 'watch'...
TypeScript error: C:/Users/ProBook/Documents/Mobile-Development/Ionic2/gonehybrid-part5/node_modules/angular2/src/facade/promise.d.ts(1,10): Error TS2661: Cannot re-export name that is not defined in the module.
8.8 MB bytes written (13.41 seconds)
[18:22:18] Finished 'watch' after 18 s
[18:22:18] Starting 'serve:before'...
[18:22:18] Finished 'serve:before' after 137 μs

Running live reload server: http://172.16.11.102:35729
Watching: www/**/*, !www/lib/**/*

And the next CSS files did not exists:

• /build/css/app.ios.css
• /build/css/app.wp.css
• /build/css/app.md.css