Exception running css-validator.jar built from latest source (regardless of the URL being tested)

Hi,

I used a copy the .jar to run the CSS validator from the command line. I 
periodically build a new copy of the .jar to incorporate fixes and changes.

I built a new copy of the .jar about an hour ago. The build was 
successful but on execution an exception is raised.

Here's how I built the .jar:
sudo mkdir /usr/share/css-validator
cd /usr/share/css-validator
sudo CVSROOT=:pserver:anonymous:anonymous@dev.w3.org:/sources/public cvs 
checkout 2002/css-validator
cd 2002/css-validator/
sudo ant jar

And here's how I'm executing it:
cd /usr/share/css-validator/2002/validator
java -jar css-validator.jar http://example.com

An exception is raised no matter the URL that is being tested:
{vextwarning=false, output=text, lang=en, warning=2, medium=all, 
profile=css3}
Exception in thread "main" java.lang.NoClassDefFoundError: 
org/apache/commons/digester/RuleSet
     at 
org.apache.velocity.tools.config.ConfigurationUtils.getDefaultTools(ConfigurationUtils.java:77)
     at 
org.apache.velocity.tools.config.ConfigurationUtils.getAutoLoaded(ConfigurationUtils.java:176)
     at 
org.apache.velocity.tools.ToolManager.autoConfigure(ToolManager.java:74)
     at org.apache.velocity.tools.ToolManager.<init>(ToolManager.java:68)
     at org.apache.velocity.tools.ToolManager.<init>(ToolManager.java:54)
     at 
org.w3c.css.css.StyleSheetGenerator.<clinit>(StyleSheetGenerator.java:97)
     at 
org.w3c.css.css.StyleReportFactory.getStyleReport(StyleReportFactory.java:18)
     at org.w3c.css.css.CssValidator.handleRequest(CssValidator.java:184)
     at org.w3c.css.css.CssValidator.main(CssValidator.java:157)
Caused by: java.lang.ClassNotFoundException: 
org.apache.commons.digester.RuleSet
     at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
     at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
     ... 9 more


I can't say I really know where to start with this and I'm sure anyone 
who does have a clue will need some more information.

Anything I can do to help?

Cheers,
Jon