Unable to set property [file] on object [log4net.Appender.FileAppender]

[moxiaxue]

I use composite configuration as bellow, it works as expected. but once the app restarts, it will report errors such as bellow:
log4net:ERROR RollingFileAppender: INTERNAL ERROR. Append is False but OutputFile [C:\ProgramData\ApplicationLogs\AtlasCopcoACLog\AC.MTC.Server\20241218.1.log] already exists.
the 20240918.1.log will be overrided

<appender name="LocalFilesAppender" type="log4net.Appender.RollingFileAppender">
	<file value="myfolder"/>
	<appendToFile value="true" />
	<staticLogFileName value="false" />
	<DatePattern value="yyyyMMdd'.log'"/>
	<!--new file will be created per day or the file size >25MB-->
	<rollingStyle value="Composite" />
	<!--new file will be created auto once the existing one exceed 25MB-->
	<maximumFileSize value="25MB" />
	<!--not more than 10 files will be kept-->
	<maxSizeRollBackups value="10" />
	<preserveLogFileNameExtension value="true"/>
	<CountDirection value="1" />
	<Encoding value="UTF-8" />
	<layout type="AC.ICA.Logger.LogContentLayout,AC.ICA.Logger">
		<conversionPattern value="%date{HH:mm:ss.fff}|%acprop{Level}|%acprop{DeviceName}|%acprop{Logger}|%acprop{Source}|%acprop{Message}%newline"/>
	</layout>
</appender>