Xindice.war- xerces?

[Matthew Van Horn]

I copied my Xindice.war file from one machine to another, and I am 
getting an error during deployment.
The error is javax.servlet.ServletException: XML-RPC support requires 
Xerces.
Root cause is java.lang.ClassNotFoundException: SAX driver not found: 
org.apache.xerces.parsers.SAXParser

The things is, I looked, and the lib secion of the web app has 
xercesImpl-2.1.0.jar, and that jar has a 
org/apache/xerces/parsers/SAXParser.class

Any ideas for me? Do I need xerces somewhere else in my class path?
Thanks for your help.
matt