Cannot start secure cluster without privileged resources.

[sri ram]

HI,
           I TRIED INSTALLING HADOOP SECURE MODE IN 0.23 VERSION.I STUCK UP
WITH THE ERROR OF

java.lang.RuntimeException: Cannot start secure cluster without privileged
resources.
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:1487)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:457)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:2263)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:2196)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:2219)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:2367)
        at
org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:2384)
2011-12-12 13:24:04,419 INFO  datanode.DataNode (StringUtils.java:run(605))
- SHUTDOWN_MSG:

I tried this post
http://www.mail-archive.com/common-user@hadoop.apache.org/msg13679.html
But fail to configure.