Probleme lancement de tomcat dans Eclipse

Bonjour,

aider-mois s'il vous plait,

avant il marchait trés bien mais maintenant quand j'essay de lancer Tomcat à travers Eclipse il m'affiche le message d'erreur suivant:

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3 févr. 2012 19:08:18 org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\jre6\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/jre6/bin/client;C:/jre6/bin;C:/jre6/lib/i386;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Broadcom\Broadcom 802.11\Driver;c:\jdk1.6;c:\jre6;C:\Program Files (x86)\MATLAB\R2009b\runtime\win32;C:\Program Files (x86)\MATLAB\R2009b\bin;C:\jdk1.6\bin;C:\mysql-5.5.8-win32\bin;;.
3 févr. 2012 19:08:18 org.apache.coyote.http11.Http11Protocol init
INFO: Initialisation de Coyote HTTP/1.1 sur http-8080
3 févr. 2012 19:08:18 org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 786 ms
3 févr. 2012 19:08:18 org.apache.catalina.core.StandardService start
INFO: Démarrage du service Catalina
3 févr. 2012 19:08:18 org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.29
java.lang.reflect.InvocationTargetException
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.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;
at org.apache.catalina.core.StandardHost$MemoryLeakTrackingListener.lifecycleEvent(StandardHost.java:561)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4625)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
... 6 more

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aider-mois s'il vous plait.

merci d'avance.