Can't locate object method "load_xml" via package "XML::LibXML"

I'll try to make this basic perl script run on basic XSLTs, but I'm 
getting this error all the time? I 've seen  this usage in Perl and XML 
Book from O-Reilly publisher.

My code:
===========================================

use XML::LibXSLT;
use XML::LibXML;

my $xslt = XML::LibXSLT->new();
my $source = XML::LibXML->load_xml(location => 
'com.redhat.rhsa-20091463.xml');

my $style_doc = XML::LibXML->load_xml(location=>'test5.xsl', no_cdata=>1);
my $stylesheet = $xslt->parse_stylesheet($style_doc);

my $results = $stylesheet->transform($source);
print $stylesheet->output_as_bytes($results);
===========================================

There is a log:
======================================
Can't locate object method "load_xml" via package "XML::LibXML" at test5.pl
        line 22 (#1)
    (F) You called a method correctly, and it correctly indicated a package
    functioning as a class, but that package doesn't define that particular
    method, nor does any of its base classes.  See perlobj.

Uncaught exception from user code:
        Can't locate object method "load_xml" via package "XML::LibXML" 
at test5.pl line 22.
 at test5.pl line 22
======================================

Does anybody know, where the problem is?

J. J.
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