android library projects cannot be launched

Through the this steps you can setup android library projects:

1. In Eclipse , Right Click on Project from Package Explorer.
2. Select Properties,.
3. Select Android from Properties pop up window,
4. See "Is Library" check box,
5. If it is checked then Unchecked "Is Library" check box.
6. Click Apply and than OK.

I got this error after adding google play services to My eclipse.