Validate jsp

Build: 3415
Server: Tomcat5.0

I tried to invoke "validate jsp" from the menu and I get the following message:

information: Compilation completed with 1 errors and 0 warnings
Information: 1 error
Information: 0 warnings
Error: org.apache.jasper.JasperException: The -uriroot option must specify a pre-existing directory The -uriroot option must specify a pre-existing directory

Where do I specify the -uriroot?

Dino