tomcat启动时出现严重错误如下所示，已经试过很多方法但都没解决，那位大侠帮帮忙啊

严重: Error deploying web application directory docsjava.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;严重: Error deploying web application directory examplesjava.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;严重: Error deploying web application directory host-managerjava.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/)严重: Error deploying web application directory managerjava.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String; at org.apache.catalina.core.StandardHost$MemoryLeakTrackingListener.lifecycleEvent(StandardHost.java:616) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4699) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079) at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1315) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061) at org.apache.catalina.core.StandardHost.start(StandardHost.java:840) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) at org.apache.catalina.core.StandardService.start(StandardService.java:525) at org.apache.catalina.core.StandardServer.start(StandardServer.java:754) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)2011-5-10 18:06:24 org.apache.coyote.http11.Http11Protocol start