NotFoundException doing Webservices tutorial...

Hi,

I'm running Geronimo 2.1.1 on OS X Leopard under JDK
1.5.0_13 and was following the tutorial at:

http://cwiki.apache.org/GMOxDOC21/developing-a-simple-calculator-web-service.html

When I get to the step in the tutorial to run jaxws/wsgen to
generate the wsdl document and schema definition, I get the following
error:

ERROR NotFoundException: jaxwsgen/wsgen

What
do I need to do in order to work through/around this issue?  As
always, any assistance is greatly appreciated.

Thanks,
John