Hepl need with properties file in Struts

Hi In my Struts application the problem is like below javax.servlet.ServletException: Missing message for key "userRegistration.firstName" in bundle "(default bundle)" for locale en_US org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:682) org.apache.jsp.user

Error with the resource file

Hi i am working on small struts applications . when i am running this application in tomcat it throwing a error like javax.servlet.ServletException: Cannot find message resources under key org.apache.struts.action.MESSAGE org.apache.jasper.runtime.PageContextImpl.handlePageException(PageConte