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java.lang.ClassCastException: 	at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:175)	at org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:150)	at org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:163)	at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:425)	at org.apache.log4j.xml.DOMConfigurator.parseRoot(DOMConfigurator.java:394)	at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:829)	at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:712)	at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:618)	at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:468)	at org.apache.log4j.LogManager.clinit(LogManager.java:122)	at org.apache.log4j.Logger.getLogger(Logger.java:104)	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:324)	at org.apache.commons.logging.impl.Log4jProxy.init(Log4jProxy.java:132)	at org.apache.commons.logging.impl.Log4JLogger.init(Log4JLogger.java:39)	at sun.reflect.GeneratedConstructorAccessor11.newInstance(Unknown Source)