what does this error mean?

• From: Marilyn L Greenwell <marilyn.greenwell@louisville.edu>
• Date: Wed, 18 Oct 2006 16:17:09 -0400
• To: <www-validator-css@w3.org>
• Message-Id: <45365386.A7F0.00EE.0@gwise.louisville.edu>

 java.lang.Exception: Unknown file
 
Thank you

Received on Wednesday, 18 October 2006 20:42:08 UTC