Hadoop0.20.0启动报错，怎么回事啊？

[wensuliang]

starting namenode, logging to /var/log/hadoop/root/hadoop-root-namenode-master.out
localhost: starting datanode, logging to /var/log/hadoop/root/hadoop-root-datanode-master.out
localhost: starting secondarynamenode, logging to /var/log/hadoop/root/hadoop-root-secondarynamenode-master.out
localhost: Exception in thread "main" java.lang.NullPointerException
localhost: at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:134)
localhost: at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:156)
localhost: at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:160)
localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.initialize(SecondaryNameNode.java:131)
localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.<init>(SecondaryNameNode.java:115)
localhost: at org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode.main(SecondaryNameNode.java:469)
starting jobtracker, logging to /var/log/hadoop/root/hadoop-root-jobtracker-master.out
localhost: starting tasktracker, logging to /var/log/hadoop/root/hadoop-root-tasktracker-master.out

[wensuliang]

来个人给分啦。