[SOLVED] Error processing element GELF ([Appenders: null]): CLASS_NOT

Error processing element GELF ([Appenders: null]): CLASS_NOT_FOUND

I am getting the following error in my log4j2.xml file:

Error processing element GELF ([Appenders: null]): CLASS_NOT_FOUND

At first I thought it was because I was referencing an invalid appender, but I still have the error after commenting it out.

Here is what I have:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="info" packages="org.graylog2.log4j2">

<Appenders>
    <GELF   name="gelfAppender" 
            server="org.graylog2.log.GelfAppender" 
            port="12201"
            hostName="some.host" 
            facility="GELF-JAVA"
            extractStacktrace="true"
            addExtendedInformation="true">
        <PatternLayout pattern="${some_pattern}"/>
         <!-- Additional fields -->
        <KeyValuePair key="someKey" value="someVal"/>
    </GELF>
</Appenders>

Solution

It turned out I was missing a couple of dependencies; no more error! :D