Canonical Url's Question

How do I go about dealing with duplicate URL’s with Google. I’m trying to use the Canonical URL option that was recently installed using the SEO Ultimate Add-on Here is one of duplicate URL’s that are being flagged with Google, do you know what I need to do with the Canonical URL to fix this issue?
For some reason Google is stating they are duplicate where in fact they are totally different URL’s. What would i have to do with the canonical URL to get this resolved?