Hi Nishan,

It seems that you've accidentally deleted the log4j file and need to add it back. Here's what that /etc/cloudera-scm-server/log4j.properties should have as contents:
# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
#
# !!!!! IMPORTANT !!!!!
# The Cloudera Manager server finds its log file by querying log4j. It
# assumes that the first file appender in this file is the server log.
# See LogUtil.getServerLogFile() for more details.
#
# Define some default values that can be overridden by system properties
cmf.root.logger=INFO,CONSOLE
cmf.log.dir=.
cmf.log.file=cmf-server.log

# Define the root logger to the system property "cmf.root.logger".
log4j.rootLogger=${cmf.root.logger}

# Logging Threshold
log4j.threshhold=ALL

# Disable most JDBC tracing by default.
log4j.logger.org.jdbcdslog=FATAL

# Disable overly loud Avro IPC logging
log4j.logger.org.apache.avro.ipc.NettyTransceiver=FATAL

# Disable overly loud Flume config validation logging
log4j.logger.org.apache.flume.conf.FlumeConfiguration=ERROR

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.target=System.err
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %5p [%t:%c{2}@%L] %m%n

log4j.appender.LOGFILE=org.apache.log4j.RollingFileAppender
log4j.appender.LOGFILE.MaxFileSize=10MB
log4j.appender.LOGFILE.MaxBackupIndex=10
log4j.appender.LOGFILE.File=${cmf.log.dir}/${cmf.log.file}
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %5p [%t:%c{2}@%L] %m%n

Thanks,
Darren