PHP Warning: mysql_fetch_row() expects parameter 1 to be resource, boolean given in /home/public_html/gestione/Commessa.php on line 76


questa la riga incriminata:

codice:
while ($riga = mysql_fetch_row($cerca)){
echo "<tr><td>$riga[0]<td>$riga[2]<td>$riga[5]<td>$riga[1]<td>$riga[102]</td><td><a href=\"Nuovo.php?id=$riga[0]\">Nuova</a></td><td><a href=\"visualizza.php?id=$riga[0]\">Visualizza</a></td><td><a href=\"modifica.php?id=$riga[0]\">Modifica</a></td><td><a href=\"pstampa.php?id=$riga[0]\">Stampa</a></td><td><a href=\"elimina.php?id=$riga[0]\">Elimina</a></td></tr>";
il var dump mi mostra : resource(4) of type (mysql result)