Android - Eclipse / Error / R cannot be resolved


I just downloaded and installed the new android SDK. I wanted to create a simple application to test drive it.

The wizard created this code:

package eu.mauriziopz.gps;
import android.app.Activity;
import android.os.Bundle;
public class ggps extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
}
but Eclipse give me this error
R cannot be resolved

on this line
setContentView(R.layout.main);

Can any one explain me why?
Ps: I do have an XML file named main.xml under res/layout/

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