goodroi - 3:34 pm on Jun 16, 2010 (gmt 0)
I'm assuming you are referring to Google Webmaster Central data.
I'm also assuming you have checked your code very thoroughly to make sure there arent any lines of hidden text or similar issues that contain disallow.
You shouldn't change your robots.txt file. Make sure you have many pages of significant text and the issue should clear itself up.
Please let me know if I misunderstood anything :)