Driving me crazying

Hi,all ,This is my experience for Struts
This tonight,I test a Struts Application,The control pannel get me this info:

org.apache.jasper.JasperException: javax.servlet.ServletException: javax.servlet.jsp.JspException: Missing message for key "registration.jsp.title"
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:541)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:417)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:803)

I was  googleing all night,found a lot of resolve way ,but can't;

finally,I examined my resolution,my application.properties is fail of place,
the correct struct is:
/
index.jsp
WEB-INF
	struts-bean.tld
	struts-html.tld
	struts-logic.tld
	web.xml
        struts-config.xml
	lib
	classes		
		application.properties
		figo
		   struts
			xxx.class
			xxx.class