lucy24 - 2:23 am on Jun 2, 2013 (gmt 0)
end tag for element "HEAD" which is not open
A common reason for this category of error message is that between
you've included some other element that automatically closes the tag. Simple example:
The act of closing a paragraph automatically shuts down any inline elements like <i>. So you will now get two separate errors: one for not closing the italics-- and then a second one for closing italics that aren't open!
Here, I'll bet you have something inside the <head> that isn't supposed to start until the <body>, so the validator assumes you've closed the <head>.