Anyone have a clue why the latest version of Struts causes this? It was working fine with my previous version of Struts but I wanted to the ValidWhen functionality, so I upgraded.

Code:
&#91;org.apache.commons.validator.ValidatorAction&#93; - <Unhandled exception thrown during validation&#58; null>
java.lang.NullPointerException
	at org.apache.struts.validator.Resources.getMessageResources&#40;Resources.java&#58;127&#41;
	at org.apache.struts.validator.Resources.getActionMessage&#40;Resources.java&#58;349&#41;
	at org.apache.struts.validator.FieldChecks.validateRequired&#40;FieldChecks.java&#58;94&#41;