ERROR cluster.ClusterScheduler: Exiting due to error from cluster scheduler: Disconnected from Spark cluster

Full error which i got

Spark context available as sc.
13/08/04 20:46:04 ERROR client.Client$ClientActor: Connection to master failed; stopping client
13/08/04 20:46:04 ERROR cluster.SparkDeploySchedulerBackend: Disconnected from Spark cluster!
13/08/04 20:46:04 ERROR cluster.ClusterScheduler: Exiting due to error from cluster scheduler: Disconnected from Spark cluster
jagat@Dell9400:~/Downloads/spark-0.7.3$


Possible Reasons

1)

I had multiple scala versions in system


Check and make sure you have only one version

2)

Check /etc/hosts file

The DNS should resolve properly

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