INFO: Illegal access: this web application instance has been stopped already. Could not load java.lang.Object

Bonjour à tous,
J'ai les erreurs suivantes qui s'affiche dans l'output quant je lance mon application crée avec le framework JSF et deployé sur le serveur d'application tomcat 6.0.26 . ces erreur n'entrainent pas l'arrêt de l'application . mais lorsque je tente d'y accéder via plusieurs machines elle plante. J'ai beaucoup cherché sur internet et en je ne trouve pas d'où viens l'erreur ni comment la corriger . si quelqu'un peut m'aider :cry:
voici le message d'erreur :

Code:

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INFO: Illegal access: this web application instance has been stopped already.  Could not load java.lang.Object.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1402)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1361)
    at com.sun.faces.application.ConverterPropertyEditorFactory$DisposableClassLoader.loadClass(ConverterPropertyEditorFactory.java:447)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
    at java.lang.Class.getConstructor0(Unknown Source)
    at java.lang.Class.newInstance0(Unknown Source)
    at java.lang.Class.newInstance(Unknown Source)
    at java.beans.PropertyEditorManager.findEditor(Unknown Source)
    at com.sun.faces.application.ApplicationImpl.addPropertyEditorIfNecessary(ApplicationImpl.java:690)
    at com.sun.faces.application.ApplicationImpl.addConverter(ApplicationImpl.java:660)
    at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:727)
    at com.sun.faces.config.ConfigureListener.configure(ConfigureListener.java:489)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:381)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:525)
    at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1359)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:297)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
    at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1500)
    at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:252)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:558)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    at java.lang.Thread.run(Unknown Source)