mysql result error (Opgelost)

$rijen_producten = mysql_query("SELECT * FROM cms_pro_cats") or die (mysql_error()); 
$aantalproductenincategorie = mysql_result($rijen_producten);

$rijen_producten = mysql_query("SELECT * FROM cms_pro_cats") or die (mysql_error()); 
$aantalproductenincategorie = mysql_result($rijen_producten);