Loopback offline sync with cordova sqlite

I am creating a cordova application with loopback offline sync using sqlite as its datasource. Here is my code:

lbclient\datasources.json:

{
 "remote": {
    "connector": "remote"
},
 "sqlite": {
    "connector": "sqlite",
    "location": "default",
    "file_name": "sqlite.sqlite3",
    "debug": false
  }
}

lbclient\lbclient.js:

'use strict';

var loopback = require('loopback');
var boot = require('loopback-boot');
var client = module.exports = loopback();

if (client.connectorRegistry) {
   console.log(client.connectorRegistry);
}
client.connector('sqlite', require('loopback-connector-cordova-sqlite'));

boot(client);

On my browser.bundle.js, I noticed that the try block is executed twice

app.dataSource = function(name, config) {
  try {
    var ds = dataSourcesFromConfig(name, config, this.connectors, this.registry);
    this.dataSources[name] =
    this.dataSources[classify(name)] =
    this.dataSources[camelize(name)] = ds;
    ds.app = this;
    return ds;
  } catch (err) {
    if (err.message) {
    err.message = g.f('Cannot create data source %s: %s',
    JSON.stringify(name), err.message);
  }
    throw err;
  }
};

Here's the dataSourcesFromConfig:

function dataSourcesFromConfig(name, config, connectorRegistry, registry) {
  var connectorPath;

  assert(typeof config === 'object',
  'can not create data source without config object');

  if (typeof config.connector === 'string') {
     name = config.connector;
     if (connectorRegistry[name]) {
        config.connector = connectorRegistry[name];
     } else {
        connectorPath = path.join(__dirname, 'connectors', name + '.js');

        if (fs.existsSync(connectorPath)) {
          config.connector = require(connectorPath);
        }
     }
    if (config.connector && typeof config.connector === 'object' && !config.connector.name)
        config.connector.name = name;
    }

   return registry.createDataSource(config);
 }

On the first run of dataSourcesFromConfig, the db (sqlite) is initialized just fine but on the second run, I now get the error:

browser.bundle.js:93172 Uncaught TypeError: Cannot create data source "sqlite": fs.existsSync is not a function

Why am I encountering that? Can you please help me. Thank you so much.

via Alisa