ขึ้นแบบนี้แก้ไงค่ะ Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in

<?
include('config.inc.php');
$query = mysql_query("SELECT * FROM poll WHERE active='yes'");
while($row = mysql_fetch_array($query)){
$pollid = $row['pollid'];
$qpoll = $row['qpoll'];
echo $qpoll."<BR>"; //แสดงหัวข้อ Poll
}
$dbquery = mysql_query("SELECT * FROM poll_ans WHERE pollid=$pollid ORDER BY ansid");
while($row = mysql_fetch_array($dbquery))
{
$ansid = $row['ansid'];
$ans = $row['ans'];
$n++;
if($n==1){$check="checked";}else $check="";
echo "<input type=\"radio\" name=\"choice[]\" value=\"$ansid\" $check> $ans<BR>"; //แสดงรายระเอียดของหัวข้อที่โหวด และฝากค่า ansid 
}
?>
<input type="hidden" name="pollid" value="<? echo $pollid;?>">