<config>
  <user>freddy</user>
  <passwd>longNails</passwd>
  <books>
    <book author="Steinbeck" title="Cannery Row"/>
    <book author="Faulkner" title="Soldier's Pay"/>
    <book author="Steinbeck" title="East of Eden"/>
  </books>
</config>


sub traverse
{
    my $node    = shift;
    print $node->nodeName() . "\n"; 
    print $node->nodeValue() . "\n";
    if( $node-> hasAttributes() )
    {
        my @attrList = $node->attributes();
        foreach my $attr (@attrList) 
        {
            my $key = $attr->nodeName();
            my $value = $attr->getValue();
            print $key . "\t" . $value . "\n" ;
        }
        print "\n";
    }
    if( $node-> hasChildNodes() )
    {
        my @cns = $node->childNodes();
        foreach my $cn (@cns) 
        {    
            my $key = $cn->getName();
            if($key !~ /\#text/ )
            {
                traverse($cn);
            }
        }
    }
}
[download]

gives errors could you help me

No, unless you specify the errors.