レールを学んでいます。https://github.com/diaspora/diasporaからコードをダウンロードしましたが、実行できません。エラーコードです:
/home/a1/.rvm/rubies/ruby-2.1.7/web/diaspora/config/environments/development.rb:42:in `block in <top (required)>': uninitialized constant TurboDevAssets (NameError)
from /home/a1/.rvm/gems/ruby-2.1.7/gems/railties-4.2.6/lib/rails/railtie.rb:210:in `instance_eval'
from /home/a1/.rvm/gems/ruby-2.1.7/gems/railties-4.2.6/lib/rails/railtie.rb:210:in `configure'
from /home/a1/.rvm/gems/ruby-2.1.7/gems/railties-4.2.6/lib/rails/railtie.rb:182:in `configure'
from /home/a1/.rvm/rubies/ruby-2.1.7/web/diaspora/config/environments/development.rb:1:in `<top (required)>'
config/environments/development.rbは次のとおりです。
Diaspora::Application.configure do
[...]
# Speed up asset serving
config.middleware.insert 0, TurboDevAssets
end
問題を解決するには?