You don't have the XML::Clean module installed on your system.

The @INC array simply tells you where perl will look (or has tried to look) for modules it needs to execute a particular script.

You can download and install the module here - everything should work as you expect once you've done that.
Instructions to help you install modules are available on CPAN here.

Hope that helps.
-- Foxcub

Update: Um, Perl is case-sensitive - CLean isn't the same as Clean. The error you're pasting shows CLean - if it's like that in your code, then you'll get the error you're seeing. Make sure you're spelling (including case) the module name correctly.

-- Foxcub