It looks like you may be missing the beginning or ending comment marker at the top of file style.css in your theme folder. It should look like this (This is coding from the default theme – yours will be different.) The point is the comments being with
/*
and end with
*/
/*
Theme Name: WordPress Default
Theme URI: http://wordpress.org/
Description: The default WordPress theme based on the famous <a href="http://binarybonsai.com/kubrick/">Kubrick</a>.
Version: 1.6
Author: Michael Heilemann
Author URI: http://binarybonsai.com/
Tags: blue, custom header, fixed width, two columns, widgets
Kubrick v1.5
http://binarybonsai.com/kubrick/
This theme was designed and built by Michael Heilemann,
whose blog you will find at http://binarybonsai.com/
The CSS, XHTML and design is released under GPL:
http://www.opensource.org/licenses/gpl-license.php
*/
/* Begin Typography & Colors */
body {
font-size: 62.5%; /* Resets 1em to 10px */
font-family: 'Lucida Grande', Verdana, Arial, Sans-Serif;
background: #d5d6d7 url('images/kubrickbgcolor.jpg');
color: #333;
text-align: center;
}