Error running rhq-data-migration during JON server upgrade

Issue

• I tried to use the rhq-data-migration.sh to migrated the data but it fails with the following error message :

[org.rhq.server.metrics.migrator.DataMigrator] Migrator class org.rhq.server.metrics.migrator.workers.AggregateDataMigrator failed. Retrying!: java.util.concurrent.ExecutionException: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried)
        at com.google.common.util.concurrent.AbstractFuture$Sync.getValue(AbstractFuture.java:306) [guava-14.0.1.jar:]
        at com.google.common.util.concurrent.AbstractFuture$Sync.get(AbstractFuture.java:293) [guava-14.0.1.jar:]
        at com.google.common.util.concurrent.AbstractFuture.get(AbstractFuture.java:116) [guava-14.0.1.jar:]
        at org.rhq.server.metrics.migrator.workers.AggregateDataMigrator.insertDataToCassandra(AggregateDataMigrator.java:258) [rhq-data-migration-4.9.0.JON320GA.jar:4.9.0.JON320GA]
        at org.rhq.server.metrics.migrator.workers.AggregateDataMigrator.performMigration(AggregateDataMigrator.java:173) [rhq-data-migration-4.9.0.JON320GA.jar:4.9.0.JON320GA]
        at org.rhq.server.metrics.migrator.workers.AggregateDataMigrator.migrate(AggregateDataMigrator.java:105) [rhq-data-migration-4.9.0.JON320GA.jar:4.9.0.JON320GA]
        at org.rhq.server.metrics.migrator.DataMigrator$1.run(DataMigrator.java:191) [rhq-data-migration-4.9.0.JON320GA.jar:4.9.0.JON320GA]
        at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_30]
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (no host was tried)
        at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:98) [cassandra-driver-core-1.0.2.jar:]
        at com.datastax.driver.core.Session$Manager.execute(Session.java:440) [cassandra-driver-core-1.0.2.jar:]
        at com.datastax.driver.core.Session$Manager.executeQuery(Session.java:476) [cassandra-driver-core-1.0.2.jar:]
        at com.datastax.driver.core.Session.executeAsync(Session.java:150) [cassandra-driver-core-1.0.2.jar:]
        at org.rhq.server.metrics.migrator.workers.AggregateDataMigrator.insertDataToCassandra(AggregateDataMigrator.java:247) [rhq-data-migration-4.9.0.JON320GA.jar:4.9.0.JON320GA]
        ... 4 more