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subprocess.CalledProcessError:returned non-zero exit status 12/127

I tried to launch the ampcamp cluster using Cygwin on Windows and tried with Ubuntu as well.
In both cases, i am running into this issue:

[[email protected]/ampcamp]$ ./spark-ec2 -i useruseastkey.pem -k useruseastkey --copy launch ampcamp
Setting up security groups...
Creating security group ampcamp-master
Creating security group ampcamp-slaves
Creating security group ampcamp-zoo
Checking for running cluster...
Using Spark AMI: ami-99bb0ff0
Launching instances...
Launched slaves, regid = r-67e38ac7
Launched master, regid = r-5ee089fe
Waiting for instances to start up...
Waiting 120 more seconds...
Deploying files to master...
/bin/sh: rsync: command not found
Traceback (most recent call last):
  File "./spark_ec2.py", line 759, in <module>
    main()
  File "./spark_ec2.py", line 648, in main
    setup_cluster(conn, master_nodes, slave_nodes, zoo_nodes, opts, True)
  File "./spark_ec2.py", line 363, in setup_cluster
    deploy_files(conn, "deploy.generic", opts, master_nodes, slave_nodes, zoo_nodes)
  File "./spark_ec2.py", line 604, in deploy_files
    subprocess.check_call(command, shell=True)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command 'rsync -rv -e 'ssh -o StrictHostKeyChecking=no -i useruseastkey.pem' '/tmp/tmpbB27rZ/' '[email protected]:/'' returned non-zero exit status 127

I am able to login to the instance, I also see that all the 4 instances are up and running.
Any help is really appreciated.

Thanks

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