single node hadoop installation on ubuntu 14.0.4 -

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I have installed Java and the houp, but when I created nominated formatting and start -all.sh , I get the following error: 

 : ~ $ hadoop namenode -format error: main class org.apache.hadoop.util.PlatformName did not find the error or could not load: Error loading main Class org.apache.hadoop.hdfs.server.namenode.NameNode


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