error while installing hadoop singlenode cluster on ubuntu 11.04

I am having trouble solving the following error in my system .Please help.I am getting the error whle installing hadoop 0.20.0 single node cluster in my ubuntu 11.04.

starting namenode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-namenode-satya.out
/usr/local/hadoop/bin/hadoop-daemon.sh: line 96: 12888 Profiling timer expired nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null
localhost: starting datanode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-datanode-satya.out
localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 96: 13023 Profiling timer expired nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null
localhost: starting secondarynamenode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-secondarynamenode-satya.out
localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 96: 13150 Profiling timer expired nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null
starting jobtracker, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-jobtracker-satya.out
/usr/local/hadoop/bin/hadoop-daemon.sh: line 96: 13187 Profiling timer expired nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null
localhost: starting tasktracker, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-tasktracker-satya.out
localhost: /usr/local/hadoop/bin/hadoop-daemon.sh: line 96: 13312 Profiling timer expired nohup nice -n $HADOOP_NICENESS "$HADOOP_HOME"/bin/hadoop --config $HADOOP_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null