Log4j Exception get after upgrade to 3.6

Get the following error, however pixory can still run. Anyone know how
to solve?

2004-02-07 00:00:48,793 ERROR [STDERR] log4j:ERROR Could not create an
Appender. Reported error follows.
2004-02-07 00:00:48,794 ERROR [STDERR] java.lang.ClassCastException
2004-02-07 00:00:48,796 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:165)
2004-02-07 00:00:48,796 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:140)
2004-02-07 00:00:48,797 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:
2004-02-07 00:00:48,797 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.
2004-02-07 00:00:48,797 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:384)
2004-02-07 00:00:48,797 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:790)
2004-02-07 00:00:48,798 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:673)
2004-02-07 00:00:48,798 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:616)
2004-02-07 00:00:48,798 ERROR [STDERR]  at
org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:602)
2004-02-07 00:00:48,798 ERROR [STDERR]  at
org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:4
2004-02-07 00:00:48,799 ERROR [STDERR]  at
org.apache.log4j.LogManager.<clinit>(LogManager.java:113)
2004-02-07 00:00:48,799 ERROR [STDERR]  at
org.apache.log4j.Category.getInstance(Category.java:530)
2004-02-07 00:00:48,799 ERROR [STDERR]  at
org.apache.commons.logging.impl.Log4jFactory.getInstance(Log4jFactory.java:140)
2004-02-07 00:00:48,799 ERROR [STDERR]  at
org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:257
2004-02-07 00:00:48,799 ERROR [STDERR]  at
org.apache.commons.logging.LogFactory.getLog(LogFactory.java:390)
2004-02-07 00:00:48,800 ERROR [STDERR]  at
net.sf.tapestry.ApplicationServlet.<clinit>(ApplicationServlet.java:125)
2004-02-07 00:00:48,800 ERROR [STDERR]  at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2004-02-07 00:00:48,800 ERROR [STDERR]  at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImp
2004-02-07 00:00:48,800 ERROR [STDERR]  at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAcc
2004-02-07 00:00:48,800 ERROR [STDERR]  at
java.lang.reflect.Constructor.newInstance(Constructor.java:274)
2004-02-07 00:00:48,800 ERROR [STDERR]  at
java.lang.Class.newInstance0(Class.java:308)
2004-02-07 00:00:48,800 ERROR [STDERR]  at
java.lang.Class.newInstance(Class.java:261)
2004-02-07 00:00:48,801 ERROR [STDERR]  at
org.mortbay.jetty.servlet.Holder.newInstance(Holder.java:176)
2004-02-07 00:00:48,801 ERROR [STDERR]  at
org.mortbay.jetty.servlet.ServletHolder.start(ServletHolder.java:215)
2004-02-07 00:00:48,801 ERROR [STDERR]  at
org.mortbay.jetty.servlet.ServletHandler.initializeServlets(ServletHandler.java:43
2004-02-07 00:00:48,801 ERROR [STDERR]  at
org.mortbay.jetty.servlet.WebApplicationHandler.initializeServlets(WebApplicationH
2004-02-07 00:00:48,801 ERROR [STDERR]  at
org.mortbay.jetty.servlet.WebApplicationContext.start(WebApplicationContext.java:4
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.mortbay.j2ee.J2EEWebApplicationContext.start(J2EEWebApplicationContext.java:85
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.jetty.JBossWebApplicationContext.start(JBossWebApplicationContext.java:8
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.jetty.Jetty.deploy(Jetty.java:331)
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.jetty.JettyService.performDeploy(JettyService.java:242)
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.web.AbstractWebContainer.start(AbstractWebContainer.java:357)
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.deployment.MainDeployer.start(MainDeployer.java:832)
2004-02-07 00:00:48,802 ERROR [STDERR]  at
org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:640)





 
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