Google has been sending out millions of these messages over the past couple of months.
Google systems have tested 177 pages from your site and found that 32% of them have critical mobile usability errors.
Google Webmaster Tools has long pointed out the important of having a mobile friendly site–but now Google is taking it seriously. When you’re looking at search results on a smart phone (which accounts for a huge percentage of people) you’ll see a little notification if a site is mobile friendly. Funnily enough, those sites will be getting most of the organic traffic.
There has never been a better time to get a mobile friendly, responsive website.
All the sites I build are responsive, and you’re welcome to ask for my help.