SO I reinstalled XML::LibXML and my script started running. I do not know what difference it made, but yes, its working now.

Yes, I am able to install other modules with can command. thanks for the pointer. I have changed the subject line.

I sure need to understand how to confirm a package on cpan website. I presumed everything that has a "::" format is a package and I was wrong.

Thank you very much to all for your timely and quick inputs..