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I think I know what I have done wrong. I placed this code line in the header instead of the index:

I only did this last week, so hopefully the damage won't last long. I still don't understand the 270 Rel Cononical errors, because they were already there. Is this a Wordpress problem?

So whats the best way to fix the 270 Rel Cononical errors? How do I actually tell Google what URL is the same pages as another URL?

The bit I'm stuck on is what am I looking for when I click on the Cannonical URL Tag?

Duplicated URLs? Too many URLs pointing to the same place?

I know I must sound stupid but I just can't get my head around the problem.... Any pointers?

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. 
</dd>

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?