diff --git a/README.md b/README.md
index 1b99104..535698c 100644
--- a/README.md
+++ b/README.md
@@ -44,7 +44,7 @@ It appears in the top menu.
 Example of Sidekiq worker.
 
 ```
-./plugins/redmine_sidekiq/workers/sandbox_worker.rb
+./plugins/redmine_sidekiq/app/workers/sandbox_worker.rb
 ```
 
 ### Sandbox Web UI
@@ -64,7 +64,7 @@ Enqueue, click the `perform_async(*args)` of the Jobs.
 Enqueue from the command line.
 
 ```
-$ script/rails runner 'SandboxWorker.perform_async'
+$ bin/rails runner 'SandboxWorker.perform_async'
 ```
 
 ## License
diff --git a/init.rb b/init.rb
index ae5f51d..1f57807 100644
--- a/init.rb
+++ b/init.rb
@@ -1,3 +1,5 @@
+$LOAD_PATH.unshift "#{File.dirname(__FILE__)}/lib"
+
 require 'redmine_sidekiq/configure'
 require 'redmine_sidekiq/rails'
 
diff --git a/lib/redmine_sidekiq/configure.rb b/lib/redmine_sidekiq/configure.rb
index cb36ced..07fee76 100644
--- a/lib/redmine_sidekiq/configure.rb
+++ b/lib/redmine_sidekiq/configure.rb
@@ -7,9 +7,9 @@
 
 module RedmineSidekiq
   class Configure
-    file = File.join(Rails.root, 'plugins/redmine_sidekiq/config/sidekiq.yml')
+    file = File.join(::Rails.root, 'plugins/redmine_sidekiq/config/sidekiq.yml')
     if File.exist?(file)
-      config = YAML.load_file(file)[Rails.env]
+      config = YAML.load_file(file)[::Rails.env]
       redis_conf = config['redis'].symbolize_keys
     end