title: Error in Android Manifest.. Please
body: <p>Im beginner for android developing.. I change the android:label text and now it gives me an error on this line on "android:label="@string/title_activity_display_message" 
  I just add the "title_activity_display_message"</p>
  
  <pre><code> &lt;activity
          android:name="com.celtic.myfirstapp.DisplayMessageActivity"
          android:label="@string/title_activity_display_message" &gt;
      &lt;/activity&gt;
  </code></pre>