Rails невалидна байт последователност в utf-8 (ArgumentError) - рубинка по релси

Всичко, което правя, е rails s от кода, изтеглен от сървър, който работи без проблем, но е упорито да премине тази грешка

rails s
=> Booting Thin
=> Rails 4.0.2 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/usr/share/rvm/gems/ruby-2.1.4/gems/rack-1.5.2/lib/rack/builder.rb:36:in `[]": invalid byte sequence in utf-8 (ArgumentError)
from /usr/share/rvm/gems/ruby-2.1.4/gems/rack-1.5.2/lib/rack/builder.rb:36:in `parse_file"
from /usr/share/rvm/gems/ruby-2.1.4/gems/rack-1.5.2/lib/rack/server.rb:277:in `build_app_and_options_from_config"
from /usr/share/rvm/gems/ruby-2.1.4/gems/rack-1.5.2/lib/rack/server.rb:199:in `app"
from /usr/share/rvm/gems/ruby-2.1.4/gems/railties-4.0.2/lib/rails/commands/server.rb:48:in `app"
from /usr/share/rvm/gems/ruby-2.1.4/gems/rack-1.5.2/lib/rack/server.rb:314:in `wrapped_app"
from /usr/share/rvm/gems/ruby-2.1.4/gems/railties-4.0.2/lib/rails/commands/server.rb:75:in `start"
from /usr/share/rvm/gems/ruby-2.1.4/gems/railties-4.0.2/lib/rails/commands.rb:76:in `block in <top (required)>"
from /usr/share/rvm/gems/ruby-2.1.4/gems/railties-4.0.2/lib/rails/commands.rb:71:in `tap"
from /usr/share/rvm/gems/ruby-2.1.4/gems/railties-4.0.2/lib/rails/commands.rb:71:in `<top (required)>"
from bin/rails:4:in `require"
from bin/rails:4:in `<main>"

всяка малка помощ ще ми е животоспасяващ съвет, който ще блъска главата ми за няколко дни с многобройни инсталации и конфигурации.

Благодаря предварително.

Отговори:

употреба gem "rack-utf8_sanitizer" или gem "handle_invalid_percent_encoding_requests" във вашия gemfile и стартирайте bundle.