Unable to run replicator due to bad pickle data error

I have a multi node setup, one proxy server and 3 storage nodes.
I have created ring files referring to this documentation (http://docs.openstack.org/trunk/openstack-compute/install/apt/content/osfolubuntu-swift.html). then copied all ring files to the 3 storage nodes.

When I run swift-init all start command on the swift storage node, it gives me following error :-

File "/usr/bin/swift-object-replicator", line 23, in <module>
    run_daemon(ObjectReplicator, conf_file, **options)
  File "/usr/lib/python2.7/dist-packages/swift/common/daemon.py", line 88, in run_daemon
    klass(conf).run(once=once, **kwargs)
  File "/usr/lib/python2.7/dist-packages/swift/obj/replicator.py", line 239, in __init__
    self.object_ring = Ring(join(self.swift_dir, 'object.ring.gz'))
  File "/usr/lib/python2.7/dist-packages/swift/common/ring/ring.py", line 51, in __init__
    self._reload(force=True)
  File "/usr/lib/python2.7/dist-packages/swift/common/ring/ring.py", line 56, in _reload
    ring_data = pickle.load(GzipFile(self.pickle_gz_path, 'rb'))
cPickle.UnpicklingError: bad pickle data

Note: I get same error when I run container/account replicator.

Any idea why it's not able to read the ring files successfully?