HADOOP copyFromLocal DataStreamer exception - hadoop

Question

I'm using Hadoop 0.20.203, and I have a cluster with nodes 0 ~ 24. cluster0 is used as a NameNode, and all others are currently used as DataNodes.
I'm currently trying to execute WordCount example, however when I try to -copyFromLocal into DFS, following message is shown :
aqjune#cluster0:~>> $HADOOP_HOME/bin/hadoop dfs -copyFromLocal pg132.txt /user/aqjune/input/pg132.txt
14/06/17 19:54:01 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.ConnectException: Connection refused
14/06/17 19:54:01 INFO hdfs.DFSClient: Abandoning block blk_-7530678618792869516_1003
14/06/17 19:54:07 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.ConnectException: Connection refused
14/06/17 19:54:07 INFO hdfs.DFSClient: Abandoning block blk_-7462751912508683911_1003
14/06/17 19:54:13 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.ConnectException: Connection refused
14/06/17 19:54:13 INFO hdfs.DFSClient: Abandoning block blk_252255837066920011_1003
14/06/17 19:54:19 INFO hdfs.DFSClient: Exception in createBlockOutputStream java.net.ConnectException: Connection refused
14/06/17 19:54:19 INFO hdfs.DFSClient: Abandoning block blk_4030900909035905642_1003
14/06/17 19:54:25 WARN hdfs.DFSClient: DataStreamer Exception: java.io.IOException: Unable to create new block.
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3002)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)
14/06/17 19:54:25 WARN hdfs.DFSClient: Error Recovery for block blk_4030900909035905642_1003 bad datanode[0] nodes == null
14/06/17 19:54:25 WARN hdfs.DFSClient: Could not get block locations. Source file "/user/aqjune/input/pg132.txt" - Aborting...
copyFromLocal: Connection refused
14/06/17 19:54:25 ERROR hdfs.DFSClient: Exception closing file /user/aqjune/input/pg132.txt : java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592)
at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:406)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.createBlockOutputStream(DFSClient.java:3028)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:2983)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2000(DFSClient.java:2255)
at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2446)
And then only empty file was created ;
aqjune#grey0:~/hadoop>> bin/hadoop dfs -lsr /
drwxr-xr-x - aqjune supergroup 0 2014-06-17 19:45 /user
drwxr-xr-x - aqjune supergroup 0 2014-06-17 19:45 /user/aqjune
drwxr-xr-x - aqjune supergroup 0 2014-06-17 19:54 /user/aqjune/input
-rw-r--r-- 1 aqjune supergroup 0 2014-06-17 19:54 /user/aqjune/input/pg132.txt
I can't figure out the cause of this problem. Can I get some hint for this?