Unable to start Mongo-back-end

[procode7]

C:\elk\statsD\node_modules\statsd\node_modules\mongo-statsd-backend\lib\index.js:21
new mongo.Db(task.name, new mongo.Server(options.host, options.port)).open(function(err, db) {
^

TypeError: (intermediate value).open is not a function
at C:\elk\statsD\node_modules\statsd\node_modules\mongo-statsd-backend\lib\index.js:21:73
at C:\elk\statsD\node_modules\statsd\node_modules\async\dist\async.js:4096:9
at Object.process (C:\elk\statsD\node_modules\statsd\node_modules\async\dist\async.js:2344:17)
at C:\elk\statsD\node_modules\statsd\node_modules\async\dist\async.js:2252:19

.Conf File

{
mongoHost: 'localhost',
mongoPort: 27017,
mongoMax: 2160,
mongoPrefix: true,
mongoName: 'testdata',
backends: ['C:\elk\statsD\node_modules\statsd\node_modules\mongo-statsd-backend\lib\index.js']
}