Google Webmaster Tools Mobile Usability Issues

Hello, I have all my sites using Catch Themes registered with Google Webmaster Tools and Google sends me an e-mail that says "Fix mobile usability issues...." "Google systems have tested 67 pages from your site and found that 100% of them have critical mobile usability errors. " The errors they complain of "Viewport not configured, Small font size, Tough elements too close, Content not sized to viewport" ..." I am wondering if these errors should be something I should be concerned of. And, I was wondering how much CatchThemes pays attention to Google Webmaster tools? Thanks! Leslie