求助：Struts错误提示

原来是在JB2005下开发的，没有错误
现在装了JB2006，他就报错了An error occurred in the bean. Error Message is: Cannot find message resources under key org.apache.struts.action.MESSAGEStack Trace is : javax.servlet.jsp.JspException: Cannot find message resources under key org.apache.struts.action.MESSAGE
 at org.apache.struts.taglib.TagUtils.retrieveMessageResources(TagUtils.java:1233)
 at org.apache.struts.taglib.TagUtils.message(TagUtils.java:1082)
 at org.apache.struts.taglib.bean.MessageTag.doStartTag(MessageTag.java:226)
 at org.apache.jsp.index_jsp._jspx_meth_bean_message_0(org.apache.jsp.index_jsp:130)
 at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:90)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at app.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:23)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at app.filter.CheckUserFilter.doFilter(CheckUserFilter.java:33)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
 at java.lang.Thread.run(Thread.java:595)这是怎么回事啊？