Problem with Validator 1.1.3 in Struts 1.2.7

[burrfoot]

We're using Struts validator with our forms for validating date, number (integer and float) and e-mail fields. We apply, as normal, validation when submitting the form: functions work well and application continues executing without problem, but console (Tomcat 5.0) reports the following error:

[ERROR] DynaValidatorForm - org.apache.struts.validator.FieldChecks.validateDate(java.lang.Object, org.apache.commons.validator.ValidatorAction, org.apache.commons.validator.Field, org.apache.struts.action.ActionMessages, javax.servlet.http.HttpServletRequest) <org.apache.commons.validator.ValidatorException: org.apache.struts.validator.FieldChecks.validateDate(java.lang.Object, org.apache.commons.validator.ValidatorAction, org.apache.commons.validator.Field, org.apache.struts.action.ActionMessages, javax.servlet.http.HttpServletRequest)>org.apache.commons.validator.ValidatorException: org.apache.struts.validator.FieldChecks.validateDate(java.lang.Object, org.apache.commons.validator.ValidatorAction, org.apache.commons.validator.Field, org.apache.struts.action.ActionMessages, javax.servlet.http.HttpServletRequest)
at org.apache.commons.validator.ValidatorAction.loadValidationMethod(ValidatorAction.java:627)
at org.apache.commons.validator.ValidatorAction.executeValidationMethod(ValidatorAction.java:557)
at org.apache.commons.validator.Field.validateForRule(Field.java:827)
...
...
...
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)

Can somebody help me about it? Thank you.