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Error in : hadoop fsck /

Hi all,

I am running hadoop-0.20.2 on single node cluster,

I run the command

hadoop fsck /

it shows error:

Exception in thread "main" java.net.UnknownHostException: http
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
    at java.net.Socket.connect(Socket.java:579)
    at java.net.Socket.connect(Socket.java:528)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:378)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:473)
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:203)
    at sun.net.www.http.HttpClient.New(HttpClient.java:290)
    at sun.net.www.http.HttpClient.New(HttpClient.java:306)
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:995)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:931)
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:849)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299)
    at org.apache.hadoop.hdfs.tools.DFSck.run(DFSck.java:123)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
    at org.apache.hadoop.hdfs.tools.DFSck.main(DFSck.java:159)
Please suggest why it so..  it should show the health status: