As I said in title, I can not get rid of duplicated titles, indexed by Google and reported in Google Webmaster tools.

Links that gives me problems are like:

http://www.domain.com/send-gifts/e6/
http://www.domain.com/send-gifts/E6/

I tried by adding canonical meta tag, but it's still reported as duplicated.

My canonical tag looks like:

<link rel="canonical" href="http://www.domain.com/send-gifts/e6/">

Can you tell me What can I do to get rid of that?