Referencing the google-play-services library

Question

I\'m working on a project using the Google Maps Android API v2, and I have a problem when I start referencing google-play-services_lib. A red exclamation mark appears on my proj

Answer 1

Tried the best answer above but it still didn't work. After trying all the others and continue searching in other places but for no good.

What eventually solved the issue was to RESTART ECLIPSE and clean (after executing what's written in the best answer above).