ERRO:Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result resour

[Sadanr]

AYUDANME A SOLUCIONAR ME ESTOY VOLVIENDO LOCO! TENGO ESTE PROBLEMA: Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result resource in /home/chilpanc/public_html/chilpo/index.php on line 11

MI CODIGO ES:
mysql_select_db(NOTI, $db);
$query= mysql_query("select * from almacena");
while($reg = mysql_fetch_row($query)){
foreach($reg as $cambia){
echo "<td>",$cambia,"</td>";
}
}