ERROR Could not find value for key log4j.appender.RFA

[#1]

I installed Cloudera Quickstart VM 5.13 on virtualbox and I'm trying to start hadoop server with the command sudo service hadoop-hdfs-namenode start

But i'm getting these two errors: 

log4j:ERROR Could not find value for key log4j.appender.RFA
log4j:ERROR Could not instantiate appender named "RFA"

This is the full output of the command:

[root@quickstart etc]# sudo service hadoop-hdfs-namenode start
starting namenode, logging to /var/log/hadoop-hdfs/hadoop-hdfs-namenode-quickstart.cloudera.out
log4j:ERROR Could not find value for key log4j.appender.RFA
log4j:ERROR Could not instantiate appender named "RFA".
log4j:WARN No appenders could be found for logger.(org.apache.hadoop.hdfs.server.namenode.NameNode).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Failed to start Hadoop namenode. Return value: 1 [FAILED]

Can anyone can help me with this issue?

[#2 · Accepted solution]

I found my log4j.properties file (my case ./workspace/training/conf/log4j.properties) and i and added these two lines and it solved the problem :

log4j.appender.RFA=org.apache.log4j.ConsoleAppender log4j.appender.RFA.layout=org.apache.log4j.PatternLayout