I was also getting the error pop up too:
I found the following on stack overflow that is the key as my project is using Html5.
I have the in my project
Excerpt of what I did that worked.
Note the the [if] tag before the <!doctype html>
<!--[if HTML5]><![endif]--> <!doctype html> <!--[if the boilerplate conditionals goes here<![endif]--> <head> <!--[if !HTML5]> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <![endif]-->