Error filterStart这个是出了什么问题啊？？

2011-4-6 16:42:08 org.apache.coyote.http11.Http11Protocol init
信息: Initializing Coyote HTTP/1.1 on http-8080
2011-4-6 16:42:08 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 484 ms
2011-4-6 16:42:08 org.apache.catalina.core.StandardService start
信息: Starting service Catalina
2011-4-6 16:42:08 org.apache.catalina.core.StandardEngine start
信息: Starting Servlet Engine: Apache Tomcat/5.5.9
2011-4-6 16:42:08 org.apache.catalina.core.StandardHost start
信息: XML validation disabled
2011-4-6 16:42:09 org.apache.catalina.core.ApplicationContext log
信息: org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
log4j:WARN No appenders could be found for logger (org.apache.catalina.session.ManagerBase).
log4j:WARN Please initialize the log4j system properly.
2011-4-6 16:42:10 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2011-4-6 16:42:10 org.apache.catalina.core.StandardContext start
严重: Context [/EDaiYan] startup failed due to previous errors
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
信息: ContextListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
信息: SessionListener: contextInitialized()
2011-4-6 16:42:11 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2011-4-6 16:42:11 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2011-4-6 16:42:11 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/31  config=null
2011-4-6 16:42:11 org.apache.catalina.storeconfig.StoreLoader load
信息: Find registry server-registry.xml at classpath resource
2011-4-6 16:42:11 org.apache.catalina.startup.Catalina start
信息: Server startup in 2875 ms