How do I reduce my vast number of errors that SEO Moz has picked up?

[Saunders1865]

Hi, The number of errors on my site recently jumped up by 450.  Most of them are duplicate page content and title errors. I am confused as to how the site suddenly got so many errors.  I recently added a new sitemap extension to the site as I was told by my developers that it was hacked a couple of months ago. Please could someone help resolve these errors?

[tomcraig86]

This question is really site specific. I've recently had to deal with a similar issue after our new website was put live a little ahead of when we would have liked it to be.

There might be a few things you can do:

Robots txt disallow all archive pages,

De-duplicate any duplicate content on pages (SEOMoz will tell you which ones)

Check the image below, with some hard work it is possible to get the errors down to 0!

WM6kA.png