Warning: mysql_fetch_array(): supplied argument ..... (Opgelost)

<?php
    $sql_details = mysql_query("SELECT * FROM nieuws ORDER BY datum_invoer DESC LIMIT 15");
    while ($row_detail = mysql_fetch_array($sql_details)) {
        $id = $row_detail['id'];
        $datum = $row_detail['datum_invoer'];
        $titel = $row_detail['titel'];
        $nieuws = $row_detail['nieuws'];
	
?>
<table width="100%" border="0">
  <tr>
    <td width="20%" align="left" style="font-size:12px"><?php echo cnv_dat($datum); ?></td>
    <td align="left" style="font-size:12px"><a href="index.php?location=detail_nieuws&id=<?php echo $id; ?>"><?php echo $titel; ?></a></td>
  </tr>
    <?
  }
  ?>
</table>

<?php
    $sql_details = mysql_query("SELECT * FROM nieuws ORDER BY datum_invoer DESC LIMIT 15");
    while ($row_detail = mysql_fetch_array($sql_details)) {
        $id = $row_detail['id'];
        $datum = $row_detail['datum_invoer'];
        $titel = $row_detail['titel'];
        $nieuws = $row_detail['nieuws'];
 
?>
<table width="100%" border="0">
  <tr>
    <td width="20%" align="left" style="font-size:12px"><?php echo cnv_dat($datum); ?></td>
    <td align="left" style="font-size:12px"><a href="index.php?location=detail_nieuws&id=<?php echo $id; ?>"><?php echo $titel; ?></a></td>
  </tr>
    <?
  }
  ?>
</table>