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I'm really stuck on how to fix up Rel Canonical errors on a Wordpress site. I went in and changed all the URLs to remove the www and added / to the end. I get this message on page analysis details: <dt>Canonical URL</dt> <dd>"http://www.some-url.com.au/",</dd> <dd>"http://some-url..com.au/", and</dd> <dd>"http://some-url..com.au/"</dd> <dd>Well the first one with the www doesn't exists and the second two urls are the same! (Note that I have removed the actual URL for this post)</dd> <dd>I'm not sure how to read and fix the errors from the reports ether. The only issues I can see is that the 'Tag Value' has the www and the 'Page Title - URL' doesn't have the www. 
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I was looking through the 'Duplicate Page Content' and Too Many On-Page Link' errors and they all seem to be linked to the 'Tags' on my blog pages. Is this really a problem and if so how should I be using tags properly to get the best SEO rewards?