Error on using https://github.com/lulalala/utf8-cleaner for a rails app

gistfile1.txt

[2019-07-26 07:36:03 +0000] [16] [application:test] exception: undefined method `new' for "UTF8Cleaner::Middleware":String
Did you mean?  next
/bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:301:in `write': Input/output error (Errno::EIO)
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:301:in `puts'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:301:in `print_exception'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:215:in `rescue in serve'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:226:in `serve'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
        from /bundle/ruby/2.4.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /usr/local/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from /usr/local/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from -e:1:in `<main>'