Thanks.
PHP Code:
<head>
<title>Scrambled</title>
<meta name="author" content="Leo Nikoleyevich Tolstoy"/>
<meta name="generator" content="Duke Classics"/>
<link href="stylesheet.css" type="text/css" rel="stylesheet"/>
<style type="text/css"> </style>
</head>
The problem is the <style> tag with empty / white spaces for a value.
Delete that line and the error will be cleared.
== Edit ==
You then need to relink the stylesheet to the html page. That will fix the error.