it seems that you have more than one jar under assembly/target/scala-2.9.3/ 
directory 

just remove all but one 

-- 
Nan Zhu


On Sunday, January 5, 2014 at 10:37 PM, danoomistmatiste wrote:

> Hi, I have installed and built spark-0.8.1-incubating-bin-cdh4 with sbt/sbt
> assembly. I am running this with scala 2.9.3. When i try to start spark
> master (./start-master.sh (http://start-master.sh)), I get this error message.
> 
> failed to launch org.apache.spark.deploy.master.Master:
> spark-assembly_2.9.3-0.8.1-incubating-hadoop2.0.0-mr1-cdh4.2.0.jar
> Please remove all but one jar.
> full log in
> /Users/hadoop/spark-0.8.1-incubating-bin-cdh4/bin/../logs/spark-hadoop-org.apache.spark.deploy.master.Master-1-localhost.out
> 
> 
> 
> 
> --
> View this message in context: 
> http://apache-spark-user-list.1001560.n3.nabble.com/Cannot-start-spark-master-tp301.html
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> (http://Nabble.com).
> 
> 


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