Getting 'uninitialized constant ActionDispatch::Routing::Mapper::Scope (NameError)' with rails 3

[betosalvador]

Hello.

I'm trying to solve this problem, but I have no success.

I'm using rails 3.2 with the lastest version of devise_token_auth and after the installation, when I try to run the server, I'm getting this error:

betosalvador@ubuntu-work:~/hubsystem$ rails s
=> Booting WEBrick
=> Rails 3.2.18 application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
Exiting
/home/betosalvador/.rvm/gems/ruby-2.1.5/gems/devise_token_auth-0.1.42/lib/devise_token_auth/rails/routes.rb:43:in `block in mount_devise_token_auth_for': uninitialized constant ActionDispatch::Routing::Mapper::Scope (NameError)
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/devise_token_auth-0.1.42/lib/devise_token_auth/rails/routes.rb:104:in `unnest_namespace'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/devise_token_auth-0.1.42/lib/devise_token_auth/rails/routes.rb:35:in `mount_devise_token_auth_for'
  from /home/betosalvador/hubsystem/config/routes.rb:12:in `block (3 levels) in <top (required)>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/mapper.rb:617:in `scope'
  from /home/betosalvador/hubsystem/config/routes.rb:11:in `block (2 levels) in <top (required)>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/mapper.rb:683:in `block in namespace'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/mapper.rb:617:in `scope'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/mapper.rb:683:in `namespace'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/mapper.rb:1235:in `namespace'
  from /home/betosalvador/hubsystem/config/routes.rb:10:in `block in <top (required)>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:285:in `instance_exec'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:285:in `eval_block'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/actionpack-3.2.18/lib/action_dispatch/routing/route_set.rb:263:in `draw'
  from /home/betosalvador/hubsystem/config/routes.rb:5:in `<top (required)>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:40:in `each'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:40:in `load_paths'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:16:in `reload!'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:26:in `block in updater'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/activesupport-3.2.18/lib/active_support/file_update_checker.rb:78:in `call'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/activesupport-3.2.18/lib/active_support/file_update_checker.rb:78:in `execute'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:27:in `updater'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application/finisher.rb:66:in `block in <module:Finisher>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/initializable.rb:30:in `instance_exec'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/initializable.rb:30:in `run'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/initializable.rb:55:in `block in run_initializers'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/initializable.rb:54:in `each'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/initializable.rb:54:in `run_initializers'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/application.rb:136:in `initialize!'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/railtie/configurable.rb:30:in `method_missing'
  from /home/betosalvador/hubsystem/config/environment.rb:8:in `<top (required)>'
  from /home/betosalvador/hubsystem/config.ru:3:in `block in <main>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/builder.rb:51:in `instance_eval'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/builder.rb:51:in `initialize'
  from /home/betosalvador/hubsystem/config.ru:in `new'
  from /home/betosalvador/hubsystem/config.ru:in `<main>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/builder.rb:40:in `eval'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/builder.rb:40:in `parse_file'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/server.rb:200:in `app'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/commands/server.rb:46:in `app'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/server.rb:304:in `wrapped_app'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/rack-1.4.7/lib/rack/server.rb:254:in `start'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/commands/server.rb:70:in `start'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/commands.rb:55:in `block in <top (required)>'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/commands.rb:50:in `tap'
  from /home/betosalvador/.rvm/gems/ruby-2.1.5/gems/railties-3.2.18/lib/rails/commands.rb:50:in `<top (required)>'
  from script/rails:6:in `require'
  from script/rails:6:in `<main>'

Can anyone give me a help, please!

Thanks in advance

[betosalvador]

Hello, guys

Is there some branch/fork that supports rails 3?

Thanks in advance!

[betosalvador]

Can, anyone give me at least a tip of how I can solve this problem?

Please, I really need this.

[lynndylanhurley]

The very first version of this gem was built against rails 4.1. It won't be possible to add rails 3 support without a significant amount of work.

[betosalvador]

Thanks for response. I really would like to use this gem in my project :(

[zachfeldman]

Possible workaround has been supplied, going to close this one our for now.