undefined method `keys' for #

Facing problem when try to run 'parallel_tests' in Cucumber + Ruby framework. Command which I use:

bundle exec parallel_cucumber -n 3 features/someFeature --group-by scenarios

Error I get:

undefined method `keys' for #<Cucumber::Messages::GherkinDocument::Feature:0x07fba0b0> (NoMethodErr
or)
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:81:
in `rubify_keys'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:32:
in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:125
:in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `new'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:17:
in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/parser.rb:32:in `d
ocument'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:30:in `block in parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `each'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:21:in `compile'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/runtime.rb:75:in `run!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/cli/main.rb:34:in `execute!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/bin/cucumber:9:in `<top (required)>'
C:/Ruby26/bin/cucumber:23:in `load'
C:/Ruby26/bin/cucumber:23:in `<main>'
undefined method `keys' for #<Cucumber::Messages::GherkinDocument::Feature:0x07f959d8> (NoMethodErr
or)
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:81:
in `rubify_keys'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:32:
in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:125
:in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `new'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:17:
in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/parser.rb:32:in `d
ocument'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:30:in `block in parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `each'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:21:in `compile'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/runtime.rb:75:in `run!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/cli/main.rb:34:in `execute!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/bin/cucumber:9:in `<top (required)>'
C:/Ruby26/bin/cucumber:23:in `load'
C:/Ruby26/bin/cucumber:23:in `<main>'
undefined method `keys' for #<Cucumber::Messages::GherkinDocument::Feature:0x07f5db90> (NoMethodErr
or)
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:81:
in `rubify_keys'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:32:
in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:125
:in `initialize'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `new'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:106
:in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/ast_builder.rb:17:
in `feature'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core/gherkin/parser.rb:32:in `d
ocument'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:30:in `block in parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `each'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:29:in `parse'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-core-3.2.1/lib/cucumber/core.rb:21:in `compile'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/runtime.rb:75:in `run!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/lib/cucumber/cli/main.rb:34:in `execute!'
C:/Ruby26/lib/ruby/gems/2.6.0/gems/cucumber-3.1.2/bin/cucumber:9:in `<top (required)>'
C:/Ruby26/bin/cucumber:23:in `load'
C:/Ruby26/bin/cucumber:23:in `<main>'

Thing I want is to run different scenarios in different processes to minimize tests running time.

• Cucumber version 3.2.1
• Ruby version 2.6.0
• parallel_tests 3.0
• cuke_modeler 3.1.0
• cucumber-gherkin 14.0.1