cbtransfer - couchbstore file to csv file hangs

1. Configure CB Server and install sample bucket - beer-sample
2. Now execute the following command:
/opt/couchbase/bin/cbtransfer couchstore-files:///opt/couchbase/var/lib/couchbase/data csv:/tmp/86af4558-c461-11e6-9c7b-8e2bd5bdffb7.csv -b default -u Administrator -ppassword

There is an error on the screen:
root@node1-cb450-ubuntu14:/opt/couchbase/bin# /opt/couchbase/bin/cbtransfer couchstore-files:///opt/couchbase/var/lib/couchbase/data csv:/tmp/86af4558-c461-11e6-9c7b-8e2bd5bdffb7.csv -b default -u Administrator -p password
Exception in thread w0:
Traceback (most recent call last):
File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
self.run()
File "/usr/lib/python2.7/threading.py", line 763, in run
self._target(*self.args, **self._kwargs)
File "/opt/couchbase/lib/python/pump.py", line 321, in run_worker
curx).run()
File "/opt/couchbase/lib/python/pump.py", line 397, in run
return self.done(0)
File "/opt/couchbase/lib/python/pump.py", line 421, in done
self.sink.close()
File "/opt/couchbase/lib/python/pump_csv.py", line 239, in close
if self.csvfile is not None and self.csvfile != sys.stdout:
AttributeError: 'CSVSink' object has no attribute 'csvfile'