TypeError: Cannot call method 'create' of undefined

[ChristopherClint]

mongoose-fixture --fixture='all' --add

Loading fixtures from - mongoose-fixture-config.js
Established Connection MongoD (localhost:27017)
Mongoose-Fixture init schemas/models into conn

/usr/local/lib/node_modules/mongoose-fixture/node_modules/mongoose/node_modules/mongodb/lib/mongodb/db.js:286
      throw err;
            ^
TypeError: Cannot call method 'create' of undefined
at async.forEach.msg (/usr/local/lib/node_modules/mongoose-fixture/lib/BaseFixtureLoader.js:90:34)
at /usr/local/lib/node_modules/mongoose-fixture/node_modules/async/lib/async.js:99:13
at Array.forEach (native)
at _each (/usr/local/lib/node_modules/mongoose-fixture/node_modules/async/lib/async.js:32:24)
at Object.async.each (/usr/local/lib/node_modules/mongoose-fixture/node_modules/async/lib/async.js:98:9)
at /usr/local/lib/node_modules/mongoose-fixture/lib/BaseFixtureLoader.js:86:19
at module.exports (/var/www/dev/mysite/fixtures/Users.js:26:12)
at module.exports (/usr/local/lib/node_modules/mongoose-fixture/lib/BaseFixtureLoader.js:36:76)
at async.eachSeries.conn.close.disconnectMessage (/usr/local/lib/node_modules/mongoose-fixture/lib/MongooseFixture.js:67:17)
at iterate (/usr/local/lib/node_modules/mongoose-fixture/node_modules/async/lib/async.js:123:13)

cat fixtures/Users.js

var sha1 = require('sha1');

module.exports = function(mongoose, conn, callback){

// standard callback error
var error = null;

// create your data documents using object-literals
var fixture = [];

/*
 * Example of adding a data document/fixture item
 */
fixture.push({
    // by not defining an _id mongoose-fixture
    // will by default set a mongo ObjectID
    // defining one manually will override mongoDB
    username: 'admin',
    password: sha1('admin'),
    email: 'dev@clintagency.com',
    role: 'admin'
});

// mongoose-fixture expects implementor to return
// the callback passed in context
return callback(error, fixture);
};

cat schemas/UserSchema.js

module.exports = function(mongoose, conn) {
var UserSchema = new mongoose.Schema({
    _id       :  { type: String },
    username  :  { type: String, required: true },
    password  :  { type: String, required: true },
    email     :  { type: String, required: true, index: { unique: true } },
    role      :  { type: String, default: "normal" },
    token     :  { type: String, default: 0 },
    expired   :  { type: Date, default: Date.now },
    created   :  { type: Date, default: Date.now }
});

return {
    name: 'User',
    schema: UserSchema
};
}

cat mongoose-fixture-config.js

// Load the default object that helps manage a FixtureConfig
var FixtureConfig = require('mongoose-fixture').FixtureConfig;
var config = require('config');

// Create our fixture config with defined
// mongo-connection and file paths
var fixtureConfig = FixtureConfig({
mongoConnection:{
    'host': config.host,
    'port': config.port,
    'dbname': config.dbname
},
paths:{
    schemaPath:__dirname+'/schemas/',
    dataFixturePath:__dirname+'/fixtures/'
}
});


// Create a Listing of fixtures
var allFixtures = [
{
    itemName: 'User',
    schema: 'UserSchema',
    data:'Users',
    collection:'users'
},
];

// load fixture listings
fixtureConfig.fixtureListings.set('all', allFixtures);

// export the config
module.exports = fixtureConfig;