Google web master tool provides collection of tools for analyze the web/blog. Among those tools, HTML Improvements reports HTML errors on web/blog and provides suggestions to overcome those errors.
If you are new to Google webmaster, please look at Optimization --> HTML Improvements.
Most common error web masters are facing is duplicate meta description.
Most probably reason for that is, you have inserted same description meta tag on each and every page of the web/blog.Solution for blogspot blogs are really simple, you can find solution from here including blogger meta description best practices .
If you are non-blogspot web master, please check your individual web page meta description ,
and make sure to remove duplicate meta description tag if it is there and create page specific
description that reflect your page content as description meta tag.
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After 1 and 1/2 month time
