rails unicron エラー ArgumentError: paths need to start with /

Question

Rails 5 で unicorn + Nginx 環境を構築してます。

unicorn起動時に下記のようなエラーが出ます。
これの対処方法はございますか？

ArgumentError: paths need to start with /
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-contrib-2.0.0/lib/rack/contrib/access.rb:38:in block in remap' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-contrib-2.0.0/lib/rack/contrib/access.rb:30:in each'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-contrib-2.0.0/lib/rack/contrib/access.rb:30:in map' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-contrib-2.0.0/lib/rack/contrib/access.rb:30:in remap'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-contrib-2.0.0/lib/rack/contrib/access.rb:26:in initialize' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:35:in new'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:35:in build' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:99:in block in build'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:99:in each' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:99:in inject'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/actionpack-5.1.4/lib/action_dispatch/middleware/stack.rb:99:in build' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/engine.rb:508:in block in app'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/engine.rb:504:in synchronize' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/engine.rb:504:in app'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/application/finisher.rb:45:in block in <module:Finisher>' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in instance_exec'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/initializable.rb:30:in run' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/initializable.rb:59:in block in run_initializers'
/root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:228:in block in tsort_each' /root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:350:in block (2 levels) in each_strongly_connected_component'
/root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:431:in each_strongly_connected_component_from' /root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:349:in block in each_strongly_connected_component'
/root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:347:in each' /root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:347:in call'
/root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:347:in each_strongly_connected_component' /root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:226:in tsort_each'
/root/.rbenv/versions/2.4.1/lib/ruby/2.4.0/tsort.rb:205:in tsort_each' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/initializable.rb:58:in run_initializers'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/railties-5.1.4/lib/rails/application.rb:353:in initialize!' /var/www/dev/rails/dev1/config/environment.rb:5:in <top (required)>'
config.ru:4:in require_relative' config.ru:4:in block in <main>'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-2.0.3/lib/rack/builder.rb:55:in instance_eval' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/rack-2.0.3/lib/rack/builder.rb:55:in initialize'
config.ru:1:in new' config.ru:1:in <main>'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/lib/unicorn.rb:56:in eval' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/lib/unicorn.rb:56:in block in builder'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/bin/unicorn_rails:139:in block in rails_builder' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/lib/unicorn/http_server.rb:796:in build_app!'
/root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/lib/unicorn/http_server.rb:139:in start' /root/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/unicorn-5.3.1/bin/unicorn_rails:209:in <top (required)>'
/root/.rbenv/versions/2.4.1/bin/unicorn_rails:22:in load' /root/.rbenv/versions/2.4.1/bin/unicorn_rails:22:in <top (required)>'