DomXML problemer.

Hej eksperter!
Er der nogen der sige mig hvorfor følgende kildekode giver mig disse problemer og nogle gode forslag til hvordan jeg får det til at virke ???

FEJL:
Warning: process(): Underlying object missing in contacts/index.php on line 35

Warning: process(): Cannot fetch DOM object in contacts/index.php on line 35

Fatal error: Call to a member function on a non-object in contacts/index.php on line 36

KILDEKODE:

$query = "SELECT * FROM $table1 ORDER BY $sort ASC";
$res = mysql_query($query) or die(mysql_error( ));

// create a new XML document
$doc = domxml_new_doc('1.0');
// create root node
$root = $doc->create_element("book");
$root = $doc->append_child($root);
// process each row from the sql query
while ($row = mysql_fetch_assoc($res)) {
    // add node for each row
      $occ = $doc->create_element($table1);
      $occ = $root->append_child($occ);
      // add a child node for each field
      foreach ($row as $fieldname => $fieldvalue) {
          $child = $doc->create_element($fieldname);
        $child = $occ->append_child($child);
        $value = $doc->create_text_node($fieldvalue);
        $value = $child->append_child($value);
    } // foreach
} // while
// get completed xml document
$xml_string = utf8_encode(@$doc->dump_mem(true));
$xml_obj = (object)$xml_string;
//echo $xml_obj->scalar;
$xsldoc  = domxml_xslt_stylesheet_file("contacts.xsl");
$result  = $xsldoc->process($xml_obj);
print $result->dump_mem();