LOG4Net: Cannot find Property [additivity] to set object on [log4net.Appender.RollingFileAppender] - kubernetes

Question

Any help would be appreciated.
I am using GCP Kubernetes Engine.
Getting following error in POD:
log4net:ERROR XmlHierarchyConfigurator: Cannot find Property [additivity] to set object on [log4net.Appender.RollingFileAppender]
Here is my configuration file:
apiVersion: v1
kind: ConfigMap
metadata:
name: log4net-config
namespace: bold-services
data:
Log4Net.config: |
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<log4net threshold="ALL" debug="true">
<root>
<level value="ALL" />
<!-- <appender-ref ref="ConsoleAppender" /> -->
<appender-ref ref="FILE_DEBUG_APPENDER" />
<appender-ref ref="FILE_ERROR_APPENDER" />
</root>
<!-- === File Appender for NON-ERROR messages file === -->
<appender name="FILE_DEBUG_APPENDER" type="log4net.Appender.RollingFileAppender" class="ch.qos.logback.classic.AsyncAppender">
<file type="log4net.Util.PatternString" value="%property{AppDataPath}/logs/%property{loggername}/debug-info-%env{HOSTNAME}.txt" />
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="INFO" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<additivity value="true" />
<appendToFile value="true" />
<maxSizeRollBackups value="1" />
<maximumFileSize value="300KB" />
<rollingStyle value="Size" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<header type="log4net.Util.PatternString" value="#Software: %property{loggername} %newline#Date: %date %newline#Fields: date thread namespace methodname message %newline" />
<conversionPattern value="%date [%thread] %message%newline" />
</layout>
</appender>
<!-- === File Appender for ERROR messages file === -->
<appender name="FILE_ERROR_APPENDER" type="log4net.Appender.RollingFileAppender" class="ch.qos.logback.classic.AsyncAppender">
<file type="log4net.Util.PatternString" value="%property{AppDataPath}/logs/%property{loggername}/errors-%env{HOSTNAME}.txt" />
<filter type="log4net.Filter.LevelMatchFilter">
<levelToMatch value="ERROR" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />
<additivity value="true" />
<appendToFile value="true" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="100KB" />
<rollingStyle value="Size" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<header type="log4net.Util.PatternString" value="#Software: %property{loggername} %newline#Date: %date %newline#Fields: date thread namespace methodname message %newline" />
<conversionPattern value="%date [%thread] %-5level %message%newline" />
</layout>
</appender>
<!-- === Console Appender to use in BufferingForwardingAppender === -->
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern type="log4net.Util.PatternString" value="%newline%%-5level %property{loggername} %env{HOSTNAME} %%date [%%thread] %%message%newline" />
</layout>
</appender>
</log4net>
</configuration>