# Can't start Rails app with hotwire-rails

**URL:** <https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765>\
**Category:** rubyonrails-talk\
**Tags:** hotwire\
**Created:** [December 25, 2020, 6:31pm UTC](https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765 "2020-12-25T18:31:08Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![sdubois](https://avatars.discourse-cdn.com/v4/letter/s/a3d4f5/32.png) [@sdubois](https://discuss.rubyonrails.org/u/sdubois)\
**Post date:** [December 25, 2020, 6:31pm UTC](https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765/1 "2020-12-25T18:31:08Z")

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I’ve been trying to add the new [Hotwire Turbo](https://turbo.hotwire.dev) to our Rails 6.1.0 app with `gem 'turbo-rails'` in the Gemfile, but I just get the startup error `DEPRECATION WARNING: Initialization autoloaded the constant Turbo::Broadcastable`. Would someone have an idea how to fix it?

NB: issue also mentioned [in this Hotwire thread](https://discuss.hotwire.dev/t/upgrade-from-turbolinks-to-turbo-drive/1546/9).

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**Author:** ![fxn](https://sea2.discourse-cdn.com/rubyonrails/user_avatar/discuss.rubyonrails.org/fxn/32/12956_2.png) [@fxn](https://discuss.rubyonrails.org/u/fxn)\
**Post date:** [December 28, 2020, 7:41am UTC](https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765/2 "2020-12-28T07:41:27Z")

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It’s a warning, and we are working on it. However, your application should start unless you have warnings configured to err.

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**Author:** ![fxn](https://sea2.discourse-cdn.com/rubyonrails/user_avatar/discuss.rubyonrails.org/fxn/32/12956_2.png) [@fxn](https://discuss.rubyonrails.org/u/fxn)\
**Post date:** [December 28, 2020, 8:03pm UTC](https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765/3 "2020-12-28T20:03:24Z")

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This is fixed in the `main` branch now, don’t know when there’s going to be a release, but you could depend on that branch meanwhile.

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**Author:** ![sdubois](https://avatars.discourse-cdn.com/v4/letter/s/a3d4f5/32.png) [@sdubois](https://discuss.rubyonrails.org/u/sdubois)\
**Post date:** [December 28, 2020, 8:09pm UTC](https://discuss.rubyonrails.org/t/cant-start-rails-app-with-hotwire-rails/76765/4 "2020-12-28T20:09:29Z")

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Thank you so much @fxn. Meanwhile I can allow deprecation warnings with `config.active_support.disallowed_deprecation_warnings = []` as you suggested.