Duplicate meta tags?

Could anybody explain what duplicate meta tags means? Exploring my webmaster tools account I have stumbled upon HTML Improvements that says:

Quote:Duplicate meta descriptions - 4
Short meta descriptions - 9
Duplicate title tags - 18
Non-informative title tags - 1

What is this suppose to mean?

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It simply means that more than one web page has the same meta tag Title and Description! To see what pages Google thinks have duplicate meta tags click on those links this will open up a page with all web pages that have duplicate tags!

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So is it just a caution message from Google or duplicate tags can hurt my SEO?

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