HTML Meta Errors and Validation

The last week I’ve fallen off of the Google searches, and thought I’d check out validation and errors. I’ve read lots on whether its needed or not, but I want to make sure the following errors in my source are not causing the issues. If I disable the SEO plugin, the errors go away.

Thanks in advance for some help on this. – Matt

The site is:
http://Shetzers.com

I receive this error:
Error: Attribute xml:lang not allowed on element html at this point.

From the source:
<meta property=”og:locale” content=”en_US” />↩
<meta property=”og:type” content=”article” />↩
<meta property=”og:title” content=”Grizzly Bear Photography Workshops at Lake Clark Alaska” />↩
<meta property=”og:description” content=”Grizzly Bear photography workshops in beautiful Lake Clark National Park capturing images of Grizzly bears, also known as brown bears, in Alaska.” />↩
<meta property=”og:url” content=”http://shetzers.com/photo-workshops-tours/grizzly-bear-photography-workshop/&#8221; />↩
<meta property=”og:site_name” content=”Shetzers Photography” />↩
<meta property=”article:publisher” content=”https://www.facebook.com/pages/Shetzers-Photography-Workshops-and-Tours/144056088960208&#8243; />↩
<meta property=”fb:admins” content=”538220077″ />↩

https://wordpress.org/plugins/wordpress-seo/