I'm trying to understand how to solve this error:
Line 44, Column 16: there is no attribute "property"
<meta property="og:site_name" content="Tribe of Admins"/>
You have used the attribute named above in your document, but the document type you are using does not support that attribute for this element. This error is often caused by incorrect use of the "Strict" document type with a document that uses frames (e.g. you must use the "Transitional" document type to get the "target" attribute), or by using vendor proprietary extensions such as "marginheight" (this is usually fixed by using CSS to achieve the desired effect instead).
This error may also result if the element itself is not supported in the document type you are using, as an undefined element will have no supported attributes; in this case, see the element-undefined error message for further information.
which comes from putting my site through this link:
1) although I can find it in the source, I can't find it anywhere in the theme or the stylesheet. Where the heck is it?
2) once I find it, I don't have a clue what to do about it.