android - Error:No resource found that matches the given name (at 'title' with value '@string/action_settings') -

i can not find wrong main.xml file

here main code:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >      <item          android:id="@+id/action_settings"         android:orderincategory="100"         android:showasaction="never"         android:title="@string/action_settings"/>  </menu> 

the error face is:

error: no resource found matches given name (at 'title' value '@string/action_settings'). 

thanks

please check res/values/strings.xml , have if there <string name="action_settings"></string> value.