Hi I have a client site that's done on WordPress. The site have very good content and an average amount of backlinks. This niche is not at all competitive. But still the site is not ranking 'anywhere' in Google for its keywords. When I looked into the webmaster tools, first they showed me some 404 errors, but I rectified it. But this is the error thats showing now. Its in the "Structured Data" section and saying, Data Type - hentry & Source - Markup: microformats.org Pages, Items - 15 Items with Errors - 15 (Marked with a red exclamation mark) What is this ? How I could resolve this ?