log4j:WARN No such property [append] in org.apache.log4j.ConsoleAppender

can someone help me with this error message. I don't know why my application is not able to log messages. It is always showing the warning message when I run it. I could not get any much help in Google.

log4j:WARN No such property [append] in org.apache.log4j.ConsoleAppender

I kept the log4j.properties file under src folder

log4j.debug=true log4j.rootLogger=INFO, STDOUT

log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender log4j.appender.STDOUT.Target=System.out log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout log4j.appender.STDOUT.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss,SSS} %-5p - %-32c{1} - %m\n

My application is a Spring MVC project

Here is the complete properties file

log4j.debug=true
# Root logger option
log4j.rootLogger=INFO, STDOUT

# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender

#Redirect to Tomcat logs folder
#log4j.appender.file.File=${catalina.home}/logs/logging.log

log4j.appender.file.File=C:\\logigng.log
log4j.appender.file.MaxFileSize=10MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss,SSS} %-5p - %-32c{1} - %m\n
 
# Direct log messages to stdout
log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
#log4j.appender.STDOUT.Target=System.out
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=%d{dd MMM yyyy HH:mm:ss,SSS} %-5p - %-32c{1} - %m\n