[Theme:Photocrati] Defines.php error

Hi guys,
I recently bought a theme called PHotocrati and I’m having trouble installing it, here is the error I get.

Fatal error: Call to undefined function photocrati_gallery_file_url() in /home/content/21/11620021/html/wp-content/themes/photocrati-theme/functions/defines.php on line 7

This is the defines.php

<?php
/* ——————————— */
/* — define Photocrati constants — */
/* ——————————— */

// Gallery Constants
define( ‘PHOTOCRATI_GALLERY_PLACEHOLDER’, ‘<img class=”photocrati-placeholder aligncenter” src=”‘ . photocrati_gallery_file_uri(‘image/gallery-placeholder.gif’) . ‘” alt=””/>’ );

?>