It's just telling you that your installation of perl doesn't have a necessary extension/plugin/module. You'll need to download and install the XML parser module for perl. There's a website (
CPAN) that has tons of stuff for perl. However, you'd be much more interested in their
modules page. You should be able to browse the available modules or search for a specific one. The modules page also has a link telling you how to install a perl module.