title: How can I deal with "URI is not registered" in Manifest file created by Android Studio
body: <p>I have just created a new project in Android Studio.  The only thing I have done so far is to add two extra menu items by editing the <code>main_menu.xml</code> and <code>strings.xml</code> files.  However I am getting this error in <code>AndroidManifest.xml</code></p>
  
  <p><a href="https://i.stack.imgur.com/hRJ9v.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hRJ9v.png" alt="enter image description here"></a></p>
  
  <p>I have tried closing down Android Studio and then reopening it.  I have also tried both Clean and Rebuild Project.  None of these have helped.  I have looked in <strong>Settings->Language &amp; Frameworks->Schemas and DTDs</strong> as suggested to find that the <strong>External Schemas and DTDs</strong> section is empty.</p>
  
  <p>Additionally I have followed the <code>Fetch external resource</code> link which reports:</p>
  
  <p><strong>"Error while fetching <a href="http://schemas.android.com/apk/res/android" rel="nofollow noreferrer">http://schemas.android.com/apk/res/android</a>"</strong></p>
  
  <p>What else could be the cause of this issue?</p>