Validation errors

What file on my server would I find and fix validation errors such as the following:

Line 10, Column 32: required attribute “content” not specified
<meta http-equiv=”generator” />✉
The attribute given above is required for an element that you’ve used, but you have omitted it. For instance, in most HTML and XHTML document types the “type” attribute is required on the “script” element and the “alt” attribute is required for the “img” element.

Typical values for type are type=”text/css” for <style> and type=”text/javascript” for <script>.

Line 11, Column 35: required attribute “content” not specified
<meta http-equiv=”Content-Type” />✉
The attribute given above is required for an element that you’ve used, but you have omitted it. For instance, in most HTML and XHTML document types the “type” attribute is required on the “script” element and the “alt” attribute is required for the “img” element.

Typical values for type are type=”text/css” for <style> and type=”text/javascript” for <script>.

Line 26, Column 155: end tag for “link” omitted, but OMITTAG NO was specified
….info/wp-content/themes/sliding-door.1.5/sliding-door/imagemenu/imageMenu.css”>✉
You may have neglected to close an element, or perhaps you meant to “self-close” an element, that is, ending it with “/>” instead of “>”.

Line 26, Column 1: start tag was here
<link rel=”stylesheet” type=”text/css” media=”screen” href=”http://jdmorgan.inf… Line 83, Column 25: document type does not allow element “style” here
<style type=’text/css’>✉
The element named above was found in a context where it is not allowed. This could mean that you have incorrectly nested elements — such as a “style” element in the “body” section instead of inside “head” — or two elements that overlap (which is not allowed).

One common cause for this error is the use of XHTML syntax in HTML documents. Due to HTML’s rules of implicitly closed elements, this error can create cascading effects. For instance, using XHTML’s “self-closing” tags for “meta” and “link” in the “head” section of a HTML document may cause the parser to infer the end of the “head” section and the beginning of the “body” section (where “link” and “meta” are not allowed; hence the reported error).