Photo Gallery 1..0 Contribution Error

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I just installed PHOTO GALLERY 1.0 ONTO MY CATALOG. THE FOLLOWING ERROR POPS UP EVERYTIME I CLICK ON CLICK HERE TO VIEW PHOTO GALLERY

 

 

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /usr/local/plesk/apache/vhosts/rioexposederoticvideo.com/httpdocs/catalogrio/popup_image.php on line 103

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Line 103 starts with while

 

Here a copy of the code. I'm new to php so I appreciate the help

<?php

while ($result=mysql_fetch_array($query)) {

$title= $result["title"];

$photo= $result["photo"];

// Using HTML "img" tags for the photos, it selects the photo by it's "id" number

 

 

 

echo ("</p><p class=\"main\"><center><img src=\"gallery/$pID/$photo\" border=0></center>

 

<HR width=90% noshade color=#000000 size=1></p>");

 

}