exception occured while starting hadoop

Hi,

Installed hadoop on Ubuntu 11.10 using this tutorial : http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linu...
I tryied to start it but an exception occured and i don't know how to fix it.

Can you please explain to me what does this exception mean and how to fix it ?

hduser@ramzi-RV409-RV509-RV709:/usr/local/hadoop/bin$ hadoop namenode -format
12/01/02 20:45:23 INFO namenode.NameNode: STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = ramzi-RV409-RV509-RV709/127.0.1.1
STARTUP_MSG:   args = [-format]
STARTUP_MSG:   version = 0.20.2
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20 -r 911707; compiled by 'chrisdo' on Fri Feb 19 08:07:34 UTC 2010
************************************************************/
Re-format filesystem in  /app/hadoop/tmp/dfs/name ? (Y or N) Y
12/01/02 20:45:38 INFO namenode.FSNamesystem: fsOwner=hduser,hadoop
12/01/02 20:45:38 INFO namenode.FSNamesystem: supergroup=supergroup
12/01/02 20:45:38 INFO namenode.FSNamesystem: isPermissionEnabled=true
12/01/02 20:45:39 INFO common.Storage: Image file of size 96 saved in 0 seconds.
12/01/02 20:45:39 INFO common.Storage: Storage directory  /app/hadoop/tmp/dfs/name has been successfully formatted.
12/01/02 20:45:39 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at ramzi-RV409-RV509-RV709/127.0.1.1
************************************************************/

hduser@ramzi-RV409-RV509-RV709:/usr/local/hadoop/bin$ start-all.sh
starting namenode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-namenode-ramzi-RV409-RV509-RV709.out
localhost: starting datanode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-datanode-ramzi-RV409-RV509-RV709.out
localhost: starting secondarynamenode, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-secondarynamenode-ramzi-RV409-RV509-RV709.out
localhost: Exception in thread "main" java.lang.IllegalArgumentException
localhost:     at java.net.URI.create(URI.java:842)
localhost:     at org.apache.hadoop.fs.FileSystem.getDefaultUri(FileSystem.java:103)
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)
localhost: Caused by: java.net.URISyntaxException: Illegal character in scheme name at index 0:  hdfs://localhost:54310
localhost:     at java.net.URI$Parser.fail(URI.java:2809)
localhost:     at java.net.URI$Parser.checkChars(URI.java:2982)
starting jobtracker, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-jobtracker-ramzi-RV409-RV509-RV709.out
localhost: starting tasktracker, logging to /usr/local/hadoop/bin/../logs/hadoop-hduser-tasktracker-ramzi-RV409-RV509-RV709.out

hduser@ramzi-RV409-RV509-RV709:/usr/local/hadoop/bin$ java -version
java version "1.6.0_25"
Java(TM) SE Runtime Environment (build 1.6.0_25-b06)
Java HotSpot(TM) Server VM (build 20.0-b11, mixed mode)

hduser@ramzi-RV409-RV509-RV709:/usr/local/hadoop/bin$ ps -A | grep ssh
  992 ?        00:00:00 sshd
 1607 ?        00:00:00 ssh-agent