If you are in the middle of setting up internationalization in your brand spanking new Ruby on Rails project, you might have added a few locales including a Norwegian one for those lovely people up in northern Scandinavia.

Now, having done this, trying to call <%= I18n.t(‘hello_world’) %>, you might receive the following error:

NoMethodError: undefined method `to_sym’ for false:FalseClass

You look in your YAML files, say en.yml and no.yml, and what you have is this:

# English locale file:

en:
  hello_world: ‘Hello world!’

… and…

# Norwegian locale file:

no:
  hello_world: ‘Hej verden!’

The above is a classical YAML thing: the no: contained in the no.yml file is interpreted as a boolean, and this renders the Norwegian YAML file useless — and thus, your dandy I18n attempts bork up.

The solution is simple:

# Norwegian locale file:

"no":
  hello_world: ‘Hej verden!’

Escape the no: with quotation marks and you’re good to go.

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