Partition reassign Kafka 0.8.1.1

Hi,
I was testing out Kafka 0.8.1.1 and found that i get the following
exception during partition re-assignment :

*./kafka-reassign-partitions.sh --path-to-json-file ritest.json --zookeeper
localhost:2181*

*Partitions reassignment failed due to Partition reassignment currently in
progress for Map(). Aborting operation*
*kafka.common.AdminCommandFailedException: Partition reassignment currently
in progress for Map(). Aborting operation*
* at
kafka.admin.ReassignPartitionsCommand.reassignPartitions(ReassignPartitionsCommand.scala:91)*
* at
kafka.admin.ReassignPartitionsCommand$.main(ReassignPartitionsCommand.scala:65)*
* at
kafka.admin.ReassignPartitionsCommand.main(ReassignPartitionsCommand.scala)*

*My JSOn file is as follows *

*{"partitions": [{"topic": "ritest1", "partition": 3,
"replicas": [1,2,3] }]}*
What am I doing wrong?

Regards,
Kashyap