Error filter Start 이게 무슨 문제가 생긴 거죠?

2011-4-6 16:42:08 org.apache.coyote.http11.Http11Protocol init
 : Initializing Coyote HTTP/1.1 on http-8080
2011-4-6 16:42:08 org.apache.catalina.startup.Catalina load
 : Initialization processed in 484 ms
2011-4-6 16:42:08 org.apache.catalina.core.StandardService start
 : Starting service Catalina
2011-4-6 16:42:08 org.apache.catalina.core.StandardEngine start
 : Starting Servlet Engine: Apache Tomcat/5.5.9
2011-4-6 16:42:08 org.apache.catalina.core.StandardHost start
 : XML validation disabled
2011-4-6 16:42:09 org.apache.catalina.core.ApplicationContext log
 : 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
 : Error filterStart
2011-4-6 16:42:10 org.apache.catalina.core.StandardContext start
 : Context [/EDaiYan] startup failed due to previous errors
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
 : ContextListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
 : SessionListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
 : ContextListener: contextInitialized()
2011-4-6 16:42:10 org.apache.catalina.core.ApplicationContext log
 : SessionListener: contextInitialized()
2011-4-6 16:42:11 org.apache.coyote.http11.Http11Protocol start
 : Starting Coyote HTTP/1.1 on http-8080
2011-4-6 16:42:11 org.apache.jk.common.ChannelSocket init
 : JK: ajp13 listening on /0.0.0.0:8009
2011-4-6 16:42:11 org.apache.jk.server.JkMain start
 : Jk running ID=0 time=0/31  config=null
2011-4-6 16:42:11 org.apache.catalina.storeconfig.StoreLoader load
 : Find registry server-registry.xml at classpath resource
2011-4-6 16:42:11 org.apache.catalina.startup.Catalina start
 : Server startup in 2875 ms