CALL_AND_RETRY_LAST Allocation failed when running webdriver for browserstack in node.js

I'm trying to run the same test for two different browsers using node.js + selenium-webdriver + browserstack, but I'm getting the next error:

<--- Last few GCs --->

   41891 ms: Scavenge 2000.5 (2066.8) -> 2000.5 (2066.8) MB, 3.7 / 0 ms (+ 1.7 ms in 1 steps since last GC) [allocation failure] [incremental marking delaying mark-sweep].
   43495 ms: Mark-sweep 2000.5 (2066.8) -> 2000.4 (2066.8) MB, 1603.9 / 0 ms (+ 2.9 ms in 2 steps since start of marking, biggest step 1.7 ms) [last resort gc].
   45094 ms: Mark-sweep 2000.4 (2066.8) -> 2000.4 (2066.8) MB, 1598.7 / 0 ms [last resort gc].


<--- JS stacktrace --->

==== JS stack trace =========================================

Security context: 0x2d02b4ee3ac1 <JS Object>
    1: isNative(aka CallSiteIsNative) [native messages.js:421] [pc=0x39994742f79b] (this=0x3fdf368d2a81 <a CallSite with map 0x39c7e8ee9e71>)
    2: toString(aka CallSiteToString) [native messages.js:435] [pc=0x39994742eead] (this=0x3fdf368d2a81 <a CallSite with map 0x39c7e8ee9e71>)
    3: FormatStackTrace(aka FormatStackTrace) [native messages.js:591] [pc=0x39994742dcb7] (this=0x2d02b4e04189 <...

FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory

The code:

var webdriver = require('selenium-webdriver');
var fs = require('fs');

// Input capabilities

var capabilitiesIPhone = {
 'browserstack.user' : 'XXXX',
 'browserstack.key' : 'XXXXXX',
 'browserName' : 'iPhone',
 'platform' : 'MAC',
 'device' : 'iPhone 5'
}


var driverIPhone = new webdriver.Builder().
  usingServer('http://ift.tt/1xLqeX2').
  withCapabilities(capabilitiesIPhone).
  build();

driverIPhone.get('http://www.google.com');
//driver.findElement(webdriver.By.name('q')).sendKeys('BrowserStack');
//driver.findElement(webdriver.By.name('btnG')).click();

driverIPhone.getTitle().then(function(title) {
  console.log(title);
});

driverIPhone.takeScreenshot().then(function(data) {
    fs.writeFile('snapshotIPhone.jpg', data.replace(/^data:image\/png;base64,/,''), 'base64', function(err) {
        if(err) throw err;
    });
});

driverIPhone.quit();

// Input capabilities
var capabilitiesFX = {
  'browserName' : 'firefox',
  'browserstack.user' : 'XXXXX',
  'browserstack.key' : 'XXXXX'

var driverFX = new webdriver.Builder().
  usingServer('http://ift.tt/1xLqeX2').
  withCapabilities(capabilitiesFX).
  build();

driverFX.get(driverFX, 'http://www.google.com');
//driver.findElement(webdriver.By.name('q')).sendKeys('BrowserStack');
//driver.findElement(webdriver.By.name('btnG')).click();

driverFX.getTitle().then(function(title) {
  console.log(title);
});

driverFX.takeScreenshot().then(function(data) {
    fs.writeFile('snapshotFX.png', data.replace(/^data:image\/png;base64,/,''), 'base64', function(err) {
        if(err) throw err;
    });
});

driverFX.quit();

What am I doing wrong?