uninitialized constant DeepL::VERSION in v3.6.1

[341bms]

Bug Report: uninitialized constant DeepL::VERSION in v3.6.1

Description

When configuring the DeepL gem in a Rails initializer, an uninitialized constant DeepL::VERSION (NameError) is raised during the DeepL.configure call. The error originates from lib/deepl/configuration.rb:49 in the construct_user_agent method.

Steps to Reproduce

1. Add gem 'deepl-rb', require: 'deepl' to Gemfile
2. Run bundle install
3. Create an initializer config/initializers/deepl.rb with:

DeepL.configure do |config|
  config.auth_key = ENV['DEEPL_AUTH_KEY']
end

4. Start the Rails server with rails s

Expected Behavior

The DeepL gem should configure successfully without errors.

Actual Behavior

The application fails to start with the following error:

/lib/deepl/configuration.rb:49:in `construct_user_agent': uninitialized constant DeepL::VERSION (NameError)

Full Stack Trace

/deepl-rb-3.6.1/lib/deepl.rb:155:in `configure'
/deepl-rb-3.6.1/lib/deepl.rb:151:in `configuration'
/deepl-rb-3.6.1/lib/deepl.rb:151:in `new'
/deepl-rb-3.6.1/lib/deepl/configuration.rb:27:in `initialize'
/deepl-rb-3.6.1/lib/deepl/configuration.rb:49:in `construct_user_agent'

[JanEbbing]

I cannot reproduce this, rails s gives me

=> Booting Puma
=> Rails 8.1.1 application starting in development
=> Run `bin/rails server --help` for more startup options
Puma starting in single mode...
* Puma version: 7.1.0 ("Neon Witch")
* Ruby version: ruby 3.4.8 (2025-12-17 revision 995b59f666) +PRISM [arm64-darwin25]
*  Min threads: 3
*  Max threads: 3
*  Environment: development
*          PID: 80054
* Listening on http://127.0.0.1:3000
* Listening on http://[::1]:3000
Use Ctrl-C to stop

In your gem installation, do you have the lib/version.rb file which defines DeepL::VERSION? link