Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Cannot set property 'locale' of undefined

See original GitHub issue

I get following error:

Cannot set property 'locale' of undefined
TypeError: Cannot set property 'locale' of undefined
    at Object.i18nSetLocale [as setLocale] (C:\Users\...\project\node_modules\i18n\i18n.js:404:25)
    at C:\Users\...\project\app.js:67:10
    at Layer.handle [as handle_request] (C:\Users\...\project\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\...\project\node_modules\express\lib\router\index.js:312:13)
    at C:\Users\...\project\node_modules\express\lib\router\index.js:280:7
    at Function.process_params (C:\Users\...\project\node_modules\express\lib\router\index.js:330:12)
    at next (C:\Users\...\project\node_modules\express\lib\router\index.js:271:10)
    at i18nInit (C:\Users\...\project\node_modules\i18n\i18n.js:201:14)
    at Layer.handle [as handle_request] (C:\Users\...\project\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\...\project\node_modules\express\lib\router\index.js:312:13)
    at C:\Users\...\project\node_modules\express\lib\router\index.js:280:7
    at Function.process_params (C:\Users\...\project\node_modules\express\lib\router\index.js:330:12)
    at next (C:\Users\...\project\node_modules\express\lib\router\index.js:271:10)
    at SendStream.error (C:\Users\...\project\node_modules\express\node_modules\serve-static\index.js:120:7)
    at emitOne (events.js:77:13)
    at SendStream.emit (events.js:169:7)
    at SendStream.error (C:\Users\...\project\node_modules\express\node_modules\send\index.js:245:17)
    at SendStream.onStatError (C:\Users\...\project\node_modules\express\node_modules\send\index.js:356:12)
    at next (C:\Users\...\project\node_modules\express\node_modules\send\index.js:658:28)
    at C:\Users\...\project\node_modules\express\node_modules\send\index.js:666:23
    at FSReqWrap.oncomplete (fs.js:82:15)

Here is my code:

i18n.configure({
  locales: ['nl', 'fr'],
  register: global,
  cookie: 'gmlang',
  directory: __dirname + '/locales',
  defaultLocale: 'nl'
});

app.use(i18n.init);

app.use(function (req, res, next) {
  console.log(i18n);
  if (req.query.lang != undefined && i18n.locales.indexOf(req.query.lang) >= 0) {
    i18n.setLocale(req.query.lang);
  }else{
    i18n.setLocale(i18n.defaultLocale);
  }
  next();
});

When logging the i18n I also get an empty locales object:

{ locales: {},
  version: '0.8.2',
  configure: [Function: i18nConfigure],
  init: [Function: i18nInit],
  __: [Function: i18nTranslate],
  __mf: [Function: i18nMessageformat],
  __l: [Function: i18nTranslationList],
  __h: [Function: i18nTranslationHash],
  __n: [Function: i18nTranslatePlural],
  setLocale: [Function: i18nSetLocale],
  getLocale: [Function: i18nGetLocale],
  getCatalog: [Function: i18nGetCatalog],
  getLocales: [Function: i18nGetLocales],
  addLocale: [Function: i18nAddLocale],
  removeLocale: [Function: i18nRemoveLocale] }

Any ideas?