<rich:AjaxValidator> ERROR

[lrms017]

HI i have an issue with the <rich:AjaxValidator> when validating an input field with the "onblur" action the server log throws an exception

I read the documentation and there is nothing there regarding of a further configuration for the use of this tag so I came to the forums to see if I can get some help

the objective:

use the rich ajax validator tag on an input field

the problem:

Im getting an error when the validation occurs
Error:

Bean Validator could not be instantiated
javax.validation.ValidationException: Unable to find a default provider
 at javax.validation.Validation$GenericBootstrapImpl.configure(Validation.java:245)....

the code:

 <rich:panel styleClass="contentwrapper">
 <h:form id="Form_ListAdmin">
 <t:div id="administradoresList" styleClass="wrapperTableList">
 <a4j:commandButton value="AgregarAdministrador"
 action="#{AdministradorController.prepareForNewAdmin}"
 reRender="SelectedAdminPanel"/>
 </t:div>
 </h:form>
 <h:form id="Form_administrador">
 <rich:panel id="SelectedAdminPanel" styleClass="selection" headerClass="selectionHeader">
 <h:panelGrid id="pnpgrd_administrador" columns="3" cellspacing="15">

 <h:outputText value="Username:"/>
 <h:inputText id="txt_UsernameAdministrador" value="#{AdministradorBean.usuario}"
 required="true"
 requiredMessage="Por Favor digita el nombre de usuario"
 validatorMessage="El nombre de usuario debe contener entre 5 y 45 caracteres"
 disabled="#{AdministradorController.disableForm}"
 styleClass="formInputStyle">
 <rich:ajaxValidator event="onblur"/>
 <a4j:support event="onkeyup" action="#{AdministradorController.validateUsername}"
 ignoreDupResponses="true" ajaxSingle="true"/>
 <f:validateLength minimum="5" maximum="15"/>
 </h:inputText>
 <rich:message for="txt_UsernameAdministrador" id="usernameMessages"
 errorClass="ErrorMessageClass" errorLabelClass="ErrorLabelClass"
 infoClass="SuccessMessageClass" infoLabelClass="SuccessLabelClass">
 </rich:message>

 </h:panelGrid>
 </rich:panel>
 </h:form>
 </rich:panel>

notes:
Im using richfaces 3.3.2 SR1
and I also add the validation-api-1.0.CR3 jar to the project (from )http://repository.jboss.com/maven2/javax/validation/validation-api/1.0.CR3/

please help thanks in advance