title: plugin on same page error wen we click on
body: <p>I create a plugin in which a form have a two button, first button goes to next page and second button goes to same page. When I come on same page it is showing an error :</p>
  
  <pre><code>Fatal error: Call to undefined function add_shortcode() in C:\wamp\www\sanyam\wp-content\plugins\a.php on line 31
  </code></pre>
  
  <p><code>none-aa.php</code> is a different page on action.</p>