Fatal error: Cannot redeclare casa_views_post_execute I understand this to be two declarations of the same function, which is not allowed. But how to fix this?

Everything was fine until I started to enable the MailChimp module, then the backend has this fatal error:

Fatal error: Cannot redeclare casa_views_post_execute() (previously declared in /home/kansascasa/public_html/sites/all/themes/casa/template.php:26) in /home/kansascasa/public_html/sites/all/themes/casa_m/template.php on line 80

This is the code:

    function casa_views_post_execute(&amp;$view) {
    watchdog('theme', print_r($view-&gt;result[0], true));
  if ($view-&gt;name == 'programs2' &amp;&amp; !empty($view-&gt;result)) {
    //drupal_goto('node/' . $view-&gt;result[0]-&gt;nid);
  }
}


Second one:

function casa_views_post_execute(&amp;$view) {


}

What is the fix for this? Appreciate your help in advance.
I'm assuming you have two separate themes. Perhaps the theme in the casa_m directory is a subtheme? 

If the machine name of the theme in the /case_m/ directory is casa_m , then change the function name to casa_m_views_post_execute(&amp;$view)