Quando tento executar aparece esse erro

<internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- spec_helper (LoadError)
    from <internal:C:/Ruby31-x64/lib/ruby/site_ruby/3.1.0/rubygems/core_ext/kernel_require.rb>:85:in `require'
    from c:/pix_key/spec/pix_key_spec.rb:3:in `<main>'