diff --git a/Gemfile b/Gemfile
index 9745bdc..75ce5b8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -22,9 +22,4 @@
 source 'https://rubygems.org' do
   gem 'acts_as_list'
   gem 'activemodel-serializers-xml'
-
-  # Redmine extensions
-  unless %w(easyproject easy_gantt).any? { |plugin| Dir.exist?(File.expand_path("../../#{plugin}", __FILE__)) }
-    gem 'redmine_extensions', '~> 0.3.9'
-  end
 end
diff --git a/after_init.rb b/after_init.rb
index 397868c..2e1f564 100644
--- a/after_init.rb
+++ b/after_init.rb
@@ -22,8 +22,6 @@
 
 require_dependency File.dirname(__FILE__) + '/lib/redmine_custom_workflows.rb'
 
-ActiveSupport::Dependencies.autoload_paths << File.join(File.dirname(__FILE__), 'app')
-
 def custom_workflows_init
   # Administration menu extension
   Redmine::MenuManager.map :admin_menu do |menu|
diff --git a/lib/redmine_custom_workflows.rb b/lib/redmine_custom_workflows.rb
index 055527a..3c0fd7f 100644
--- a/lib/redmine_custom_workflows.rb
+++ b/lib/redmine_custom_workflows.rb
@@ -21,20 +21,20 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 # Hooks
-require 'redmine_custom_workflows/hooks/hooks'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/hooks/views/base_view_hooks'
 
 # Errors
-require 'redmine_custom_workflows/errors/workflow_error'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/errors/workflow_error'
 
 # Patches
-require 'redmine_custom_workflows/patches/attachment_patch'
-require 'redmine_custom_workflows/patches/group_patch'
-require 'redmine_custom_workflows/patches/issue_patch'
-require 'redmine_custom_workflows/patches/issue_relation_patch'
-require 'redmine_custom_workflows/patches/project_patch'
-require 'redmine_custom_workflows/patches/projects_helper_patch'
-require 'redmine_custom_workflows/patches/time_entry_patch'
-require 'redmine_custom_workflows/patches/user_patch'
-require 'redmine_custom_workflows/patches/version_patch'
-require 'redmine_custom_workflows/patches/wiki_content_patch'
-require 'redmine_custom_workflows/patches/wiki_page_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/attachment_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/group_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/issue_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/issue_relation_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/project_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/projects_helper_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/time_entry_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/user_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/version_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/wiki_content_patch'
+require File.dirname(__FILE__) + '/redmine_custom_workflows/patches/wiki_page_patch'
diff --git a/lib/redmine_custom_workflows/errors/workflow_error.rb b/lib/redmine_custom_workflows/errors/workflow_error.rb
index 7613889..fb6c8f7 100644
--- a/lib/redmine_custom_workflows/errors/workflow_error.rb
+++ b/lib/redmine_custom_workflows/errors/workflow_error.rb
@@ -20,11 +20,16 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-class WorkflowError < StandardError
-  attr_accessor :error
+module RedmineCustomWorkflows
+  module Errors
 
-  def initialize(message)
-    @error = message
-    super message
+    class WorkflowError < StandardError
+      attr_accessor :error
+
+      def initialize(message)
+        @error = message
+        super message
+      end
+    end
   end
-end
\ No newline at end of file
+end
diff --git a/lib/redmine_custom_workflows/hooks/hooks.rb b/lib/redmine_custom_workflows/hooks/views/base_view_hooks.rb
similarity index 72%
rename from lib/redmine_custom_workflows/hooks/hooks.rb
rename to lib/redmine_custom_workflows/hooks/views/base_view_hooks.rb
index f9f42ae..69afe6e 100644
--- a/lib/redmine_custom_workflows/hooks/hooks.rb
+++ b/lib/redmine_custom_workflows/hooks/views/base_view_hooks.rb
@@ -21,14 +21,18 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 module RedmineCustomWorkflows
+  module Hooks
+    module Views
 
-  class Hooks < Redmine::Hook::ViewListener
+      class BaseViewHooks < Redmine::Hook::ViewListener
+
+        def view_layouts_base_html_head(context={})
+          return unless /^(CustomWorkflows|Projects)/.match?(context[:controller].class.name)
+          "\n".html_safe + stylesheet_link_tag('custom_workflows.css', plugin: :redmine_custom_workflows)
+        end
+
+      end
 
-    def view_layouts_base_html_head(context={})
-      return unless /^(CustomWorkflows|Projects)/.match?(context[:controller].class.name)
-      "\n".html_safe + stylesheet_link_tag('custom_workflows.css', plugin: :redmine_custom_workflows)
     end
-
   end
-
 end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/attachment_patch.rb b/lib/redmine_custom_workflows/patches/attachment_patch.rb
index 60ffdf3..5f89b7f 100644
--- a/lib/redmine_custom_workflows/patches/attachment_patch.rb
+++ b/lib/redmine_custom_workflows/patches/attachment_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module AttachmentPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -60,6 +60,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'Attachment',
-  'RedmineCustomWorkflows::Patches::AttachmentPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Attachment',  'RedmineCustomWorkflows::Patches::AttachmentPatch'
+else
+  Attachment.prepend RedmineCustomWorkflows::Patches::AttachmentPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/group_patch.rb b/lib/redmine_custom_workflows/patches/group_patch.rb
index 2874dfe..ec87d33 100644
--- a/lib/redmine_custom_workflows/patches/group_patch.rb
+++ b/lib/redmine_custom_workflows/patches/group_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module GroupPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -74,6 +74,10 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'Group',
-  'RedmineCustomWorkflows::Patches::GroupPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Group',
+   'RedmineCustomWorkflows::Patches::GroupPatch'
+else
+  Group.prepend RedmineCustomWorkflows::Patches::GroupPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/issue_patch.rb b/lib/redmine_custom_workflows/patches/issue_patch.rb
index 522b4d0..3ff5df4 100644
--- a/lib/redmine_custom_workflows/patches/issue_patch.rb
+++ b/lib/redmine_custom_workflows/patches/issue_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module IssuePatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -88,6 +88,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'Issue',
-  'RedmineCustomWorkflows::Patches::IssuePatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Issue', 'RedmineCustomWorkflows::Patches::IssuePatch'
+else
+  Issue.prepend RedmineCustomWorkflows::Patches::IssuePatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/issue_relation_patch.rb b/lib/redmine_custom_workflows/patches/issue_relation_patch.rb
index ae90399..1733e17 100644
--- a/lib/redmine_custom_workflows/patches/issue_relation_patch.rb
+++ b/lib/redmine_custom_workflows/patches/issue_relation_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module IssueRelationPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -73,6 +73,9 @@ module RedmineCustomWorkflows
   end
 end
   
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'IssueRelation',
-  'RedmineCustomWorkflows::Patches::IssueRelationPatch'
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'IssueRelation', 'RedmineCustomWorkflows::Patches::IssueRelationPatch'
+else
+  IssueRelation.prepend RedmineCustomWorkflows::Patches::IssueRelationPatch
+end
diff --git a/lib/redmine_custom_workflows/patches/mailer_patch.rb b/lib/redmine_custom_workflows/patches/mailer_patch.rb
index 7bdee9d..6dd3e1c 100644
--- a/lib/redmine_custom_workflows/patches/mailer_patch.rb
+++ b/lib/redmine_custom_workflows/patches/mailer_patch.rb
@@ -51,5 +51,9 @@ module RedmineCustomWorkflows
   end
 end
 
-RedmineExtensions::PatchManager.register_model_patch 'Mailer',
-  'RedmineCustomWorkflows::Patches::MailerPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Mailer', 'RedmineCustomWorkflows::Patches::MailerPatch'
+else
+  Mailer.prepend RedmineCustomWorkflows::Patches::MailerPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/project_patch.rb b/lib/redmine_custom_workflows/patches/project_patch.rb
index 2083ef6..9052ac8 100644
--- a/lib/redmine_custom_workflows/patches/project_patch.rb
+++ b/lib/redmine_custom_workflows/patches/project_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module ProjectPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           has_and_belongs_to_many :custom_workflows
           safe_attributes :custom_workflow_ids, if:
@@ -75,6 +75,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'Project',
-  'RedmineCustomWorkflows::Patches::ProjectPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Project', 'RedmineCustomWorkflows::Patches::ProjectPatch'
+else
+  Project.prepend RedmineCustomWorkflows::Patches::ProjectPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/projects_helper_patch.rb b/lib/redmine_custom_workflows/patches/projects_helper_patch.rb
index 4385c2d..3f1c012 100644
--- a/lib/redmine_custom_workflows/patches/projects_helper_patch.rb
+++ b/lib/redmine_custom_workflows/patches/projects_helper_patch.rb
@@ -35,6 +35,7 @@ module RedmineCustomWorkflows
   end
 end
 
+# Apply the patch
 if Redmine::Plugin.installed?(:easy_extensions)
   RedmineExtensions::PatchManager.register_helper_patch 'ProjectsHelper',
     'RedmineCustomWorkflows::Patches::ProjectsHelperPatch', prepend: true
diff --git a/lib/redmine_custom_workflows/patches/time_entry_patch.rb b/lib/redmine_custom_workflows/patches/time_entry_patch.rb
index e688157..b29d1b9 100644
--- a/lib/redmine_custom_workflows/patches/time_entry_patch.rb
+++ b/lib/redmine_custom_workflows/patches/time_entry_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module TimeEntryPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -60,6 +60,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'TimeEntry',
-  'RedmineCustomWorkflows::Patches::TimeEntryPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'TimeEntry', 'RedmineCustomWorkflows::Patches::TimeEntryPatch'
+else
+  TimeEntry.prepend RedmineCustomWorkflows::Patches::TimeEntryPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/user_patch.rb b/lib/redmine_custom_workflows/patches/user_patch.rb
index 4132c96..824f893 100644
--- a/lib/redmine_custom_workflows/patches/user_patch.rb
+++ b/lib/redmine_custom_workflows/patches/user_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module UserPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -60,6 +60,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'User',
-  'RedmineCustomWorkflows::Patches::UserPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'User', 'RedmineCustomWorkflows::Patches::UserPatch'
+else
+  User.prepend RedmineCustomWorkflows::Patches::UserPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/version_patch.rb b/lib/redmine_custom_workflows/patches/version_patch.rb
index 3a0b88c..fc7f67d 100644
--- a/lib/redmine_custom_workflows/patches/version_patch.rb
+++ b/lib/redmine_custom_workflows/patches/version_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module VersionPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -60,6 +60,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'Version',
-'RedmineCustomWorkflows::Patches::VersionPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'Version', 'RedmineCustomWorkflows::Patches::VersionPatch'
+else
+  Version.prepend RedmineCustomWorkflows::Patches::VersionPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/wiki_content_patch.rb b/lib/redmine_custom_workflows/patches/wiki_content_patch.rb
index f21f329..68f5537 100644
--- a/lib/redmine_custom_workflows/patches/wiki_content_patch.rb
+++ b/lib/redmine_custom_workflows/patches/wiki_content_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module WikiContentPatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           before_save :before_save_custom_workflows
           after_save :after_save_custom_workflows
@@ -60,6 +60,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'WikiContent',
-  'RedmineCustomWorkflows::Patches::WikiContentPatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'WikiContent', 'RedmineCustomWorkflows::Patches::WikiContentPatch'
+else
+  WikiContent.prepend RedmineCustomWorkflows::Patches::WikiContentPatch
+end
\ No newline at end of file
diff --git a/lib/redmine_custom_workflows/patches/wiki_page_patch.rb b/lib/redmine_custom_workflows/patches/wiki_page_patch.rb
index 863c330..b076b75 100644
--- a/lib/redmine_custom_workflows/patches/wiki_page_patch.rb
+++ b/lib/redmine_custom_workflows/patches/wiki_page_patch.rb
@@ -24,7 +24,7 @@ module RedmineCustomWorkflows
   module Patches
     module WikiPagePatch
 
-      def self.included(base)
+      def self.prepended(base)
         base.class_eval do
           def self.attachments_callback(event, page, attachment)
             page.instance_variable_set :@page, page
@@ -43,6 +43,9 @@ module RedmineCustomWorkflows
   end
 end
 
-# Apply patch
-RedmineExtensions::PatchManager.register_model_patch 'WikiPage',
-  'RedmineCustomWorkflows::Patches::WikiPagePatch'
\ No newline at end of file
+# Apply the patch
+if Redmine::Plugin.installed?(:easy_extensions)
+  RedmineExtensions::PatchManager.register_model_patch 'WikiPage', 'RedmineCustomWorkflows::Patches::WikiPagePatch'
+else
+  WikiPage.prepend RedmineCustomWorkflows::Patches::WikiPagePatch
+end
\ No newline at end of file