启动TOMCAT服务器，报错Error configuring application listener of class ？

信息: validateJarFile(E:\study\apache-tomcat-6.0.37\webapps\portalFront\WEB-INF\lib\servlet-api-2.5-6.1.2rc0.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
十二月 14, 2013 9:54:45 上午 org.apache.catalina.core.StandardContext listenerStart
严重: Error configuring application listener of class com.yiliaosoft.health.heartElect.web.listener.HeartElectStartupListener
java.lang.ClassNotFoundException: com.yiliaosoft.health.heartElect.web.listener.HeartElectStartupListener
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4149)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705)
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:1317)
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:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
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:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
--------------------编程问答-------------------- 你的工程里面的lib下有了servlet的jar包了。它可能跟Tomcat的lib下的jar有冲突！
把工程下的这个jar删掉：E:\study\apache-tomcat-6.0.37\webapps\portalFront\WEB-INF\lib\servlet-api-2.5-6.1.2rc0.jar
用Tomcat的jar就行！

--------------------编程问答-------------------- 谢谢您的回复！！！

补充：Java ,  Web 开发