Can't manage CSS in Android Studio - css

I've recently started working with Android Studio.
I've imported a project that was built using Eclipse and manged to handle all the import. Still, there's one line that I can't get to work:
NativeCSS.styleWithCSS("MainCss.css",css, RemoteContentRefreshPeriod.Never);
All the text within the brackets is marked with a red under-line.
Thank you for helping me!
Update: I've alredy imported the nativeCSS.jar!

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