How to resolve this error with RoutingAppender in Log4J - "AuditLogger cannot be located"?

Question

I'm getting the following error when I run my Log4j code :

2015-07-04 19:08:04,385 ERROR Appender AuditLogger cannot be located. Route ignored

I'm trying to use the RoutingAppender (I learned about it from this question ). My log4j config files looks like this :

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">

  <Appenders>

    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
    </Console>

    <File name="MyFile" fileName="OutputLogFile.log" immediateFlush="false" append="false">
            <PatternLayout pattern="%d{yyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
    </File>


    <Routing name="Routing">
      <Routes pattern="$${sd:type}">
        <Route>
          <RollingFile name="Rolling-${sd:type}" fileName="${sd:type}.log"
                       filePattern="${sd:type}.%i.log.gz">
            <PatternLayout>
              <pattern>%d %p %c{1.} [%t] %m%n</pattern>
            </PatternLayout>
            <SizeBasedTriggeringPolicy size="500" />
          </RollingFile>
        </Route>
        <Route ref="AuditLogger" key="Audit"/>
      </Routes>
    </Routing>

  </Appenders>

  <Loggers>
    <Root level="all">
      <Appender-Ref ref="Console"/>
      <Appender-Ref ref="MyFile"/>  <!-- added_in now -->

    </Root>


  </Loggers>
</Configuration>

And my code is just a simple client/server pair (with some logger.debug("xyz") code spread throughout) .

thanks