Struts2 validation using validator xml files

I am trying to implement validation with struts as per the example in appfuse tutorial. Created files same as Userform.jsp. The fields are getting validated on submission, but the page is showing the error as below.

Created four files similar to User-validaton.xml and UserAction-validation.xml and placed in folders

src/main/java/com/.../onb/webapp/action
src/main/java/com/..../onb/action

src/main/java/com/..../onb/model
src/main/java/com/..../onb/webapp/com/netflix/onb/model

Am not sure what am doing wrong here.

############Error shown on jsp page as below #############.

Warning First Name is a required field.
Warning employee.firstName=[First Name is a required field.]
Struts Problem Report

Struts has detected an unhandled exception:
Messages:

empOnboardAction
Invalid action class configuration that references an unknown class named [empOnboardAction]

File: org/codehaus/plexus/classworlds/strategy/SelfFirstStrategy.java
Line number: 50
Stacktraces
java.lang.RuntimeException: Invalid action class configuration that references an unknown class named [empOnboardAction]

org.apache.struts2.convention.ConventionsServiceImpl.determineResultPath(ConventionsServiceImpl.java:100)
org.apache.struts2.convention.ConventionUnknownHandler.determinePath(ConventionUnknownHandler.java:385)
org.apache.struts2.convention.ConventionUnknownHandler.handleUnknownResult(ConventionUnknownHandler.java:274)
com.opensymphony.xwork2.DefaultUnknownHandlerManager.handleUnknownResult(DefaultUnknownHandlerManage