title: How do i resolve function not found in Drupal 6
body: <p>So I'm using the <code>queue_mail</code> module on Drupal 6 and everytime I call the function <code>queue_mail_send()</code>, drupal complains that it can't find the function...</p>
  
  <p>I know that there's a code registry in Drupal 7, but what about Drupal 6? how do I get Drupal 6 to recognize that function instead of returning a fatal error? </p>