Не могу понять в чем ошибка Warning: mysql_fetch_array()

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in C:\xampp\htdocs\webSite10\includes\functions.php on line 58

<?php
 function enson_konu($page)
{
  $sorgu=mysql_query("select * from sayfalar order by id desc ,isim LIMIT 
   0,4");
   while($bilgi=mysql_fetch_array($sorgu))
   {
    echo "<i class=\"fa fa-tags\" title=\"konu adı\"><a href=\"yazi.php?
    page={$bilgi[id]}\">{$bilgi[isim]}</a></i> ";
    echo "<br>";
    echo "<i class=\"fa fa-clock-o\" title=\"konu tarihi\"><a href=\"#\">
    {$bilgi[tarih]}</a></i> ";
    echo "<br>";
    echo "<br>";
    } 
 }
?>