title: Can't make a reference to google-play-service lib. How can i fix it?
body: <p>I am beginner in android app development, and i am now learning how to build a app by using Google map API v2. </p>
  
  <p>Something like this: 
  <a href="http://wptrafficanalyzer.in/blog/showing-current-location-in-google-maps-using-api-v2-with-supportmapfragment/" rel="nofollow">http://wptrafficanalyzer.in/blog/showing-current-location-in-google-maps-using-api-v2-with-supportmapfragment/</a></p>
  
  <p>However, i can't make a reference to google-play-service lib in Eclipse</p>
  
  <p>The following is my steps:</p>
  
  <ol>
  <li><p>Right Click-> Properties-> Andriod-> Library-> Add the google play service lib from my workspace</p></li>
  <li><p>It seem work (have a green tick) before I press the OK button</p></li>
  <li><p>But when i do the redo the step 1 to check  it , the green tick become a red cross</p></li>
  </ol>
  
  <p>How can i fix it?</p>