hi all,
i am trying to use displaytag in my application it was working finebut suddenly it is showing this excepton
it is working fine in tomcat 6.0 but it is not in tomcat 4.1

i am using display tag 1.2

org.apache.jasper.JasperException: This absolute uri (Display tag library - Overview) cannot be resolved in either web.xml or the jar files deployed with this application
at org.apache.jasper.compiler.DefaultErrorHandler.jsp Error(DefaultErrorHandler.java:105)
at org.apache.jasper.compiler.ErrorDispatcher.dispatc h(ErrorDispatcher.java:430)
at org.apache.jasper.compiler.ErrorDispatcher.jspErro r(ErrorDispatcher.java:154)
at org.apache.jasper.compiler.TagLibraryInfoImpl.(Tag LibraryInfoImpl.java:159)
at org.apache.jasper.compiler.Parser.parseTaglibDirec tive(Parser.java:354)
at org.apache.jasper.compiler.Parser.parseDirective(P arser.java:381)
at org.apache.jasper.compiler.Parser.parseElements(Pa rser.java:795)
at org.apache.jasper.compiler.Parser.parse(Parser.jav a:122)
at org.apache.jasper.compiler.ParserController.parse( ParserController.java:199)
at org.apache.jasper.compiler.ParserController.parse( ParserController.java:153)
at org.apache.jasper.compiler.Compiler.generateJava(C ompiler.java:227)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:369)
at org.apache.jasper.JspCompilationContext.compile(Js pCompilationContext.java:473)
at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:190)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:853)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:643)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:643)
at org.apache.catalina.valves.CertificatesValve.invok e(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.valves.CertificatesValve.invok e(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.authenticator.AuthenticatorBas e.invoke(AuthenticatorBase.java:553)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.valves.CertificatesValve.invok e(CertificatesValve.java:246)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(St andardContext.java:2417)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:643)
at org.apache.catalina.valves.ErrorDispatcherValve.in voke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:641)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$Standard PipelineValveContext.invokeNext(StandardPipeline.j ava:643)
at org.apache.catalina.core.StandardPipeline.invoke(S tandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(Cont ainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(Co yoteAdapter.java:193)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:781)
at org.apache.coyote.http11.Http11Protocol$Http11Conn ectionHandler.processConnection(Http11Protocol.jav a:549)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(P oolTcpEndpoint.java:589)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:666)
at java.lang.Thread.run(Thread.java:595)