报错！好象是资源文件的问题？这个错是什么意思？

[ray_1981]

用JBUILDER2005 开发STRUTS一个登陆的实验，报了下面的错？？？请问是什么问题

description ：The server encountered an internal error () that prevented it from fulfilling this request.
exception ：javax.servlet.ServletException: Missing message for key "login.title"
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
org.apache.jsp.login_jsp._jspService(login_jsp.java:99)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause ：javax.servlet.jsp.JspException: Missing message for key "login.title"
org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:297)
org.apache.jsp.login_jsp._jspx_meth_bean_message_0(login_jsp.java:115)
org.apache.jsp.login_jsp._jspService(login_jsp.java:79)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.0.27 logs.

[ray_1981]

信息: Initializing, config='org.apache.struts.taglib.bean.LocalStrings', returnNull=true

StandardWrapperValve[debugjsp]: Servlet.service() for servlet debugjsp threw exception

javax.servlet.jsp.JspException: Missing message for key "login.title"

javax.servlet.jsp.JspException: Missing message for key "login.title"

[ray_1981]

信息: Initializing, config='org.apache.struts.taglib.bean.LocalStrings', returnNull=true

StandardWrapperValve[debugjsp]: Servlet.service() for servlet debugjsp threw exception

javax.servlet.jsp.JspException: Missing message for key "login.title"

javax.servlet.jsp.JspException: Missing message for key "login.title"

[ray_1981]

信息: Initializing, config='org.apache.struts.taglib.bean.LocalStrings', returnNull=true
StandardWrapperValve[debugjsp]: Servlet.service() for servlet debugjsp threw exception
javax.servlet.jsp.JspException: Missing message for key "login.title"
javax.servlet.jsp.JspException: Missing message for key "login.title"

[micheall]

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