diff --git a/app/controllers/dmsf_controller.rb b/app/controllers/dmsf_controller.rb
index be6033d7..73b648a9 100644
--- a/app/controllers/dmsf_controller.rb
+++ b/app/controllers/dmsf_controller.rb
@@ -192,9 +192,9 @@ class DmsfController < ApplicationController
       else
         download_entries @selected_folders, @selected_files
       end
-    rescue RedmineDmsf::Errors::DmsfFileNotFoundError
+    rescue DmsfFileNotFoundError
       render_404
-    rescue RedmineDmsf::Errors::DmsfAccessError
+    rescue DmsfAccessError
       render_403
     rescue StandardError => e
       flash[:error] = e.message
@@ -497,16 +497,14 @@ class DmsfController < ApplicationController
   end
 
   def email_entries(selected_folders, selected_files)
-    raise RedmineDmsf::Errors::DmsfAccessError unless User.current.allowed_to?(:email_documents, @project)
+    raise DmsfAccessError unless User.current.allowed_to?(:email_documents, @project)
 
     zip = Zip.new
     zip_entries(zip, selected_folders, selected_files)
     zipped_content = zip.finish
 
     max_filesize = RedmineDmsf.dmsf_max_email_filesize
-    if max_filesize.positive? && File.size(zipped_content) > max_filesize * 1_048_576
-      raise RedmineDmsf::Errors::DmsfEmailMaxFileSizeError
-    end
+    raise DmsfEmailMaxFileSizeError if max_filesize.positive? && File.size(zipped_content) > max_filesize * 1_048_576
 
     zip.dmsf_files.each do |f|
       # Action
@@ -569,23 +567,22 @@ class DmsfController < ApplicationController
     member = Member.find_by(user_id: User.current.id, project_id: @project.id)
     selected_folders.each do |selected_folder_id|
       folder = DmsfFolder.visible.find_by(id: selected_folder_id)
-      raise RedmineDmsf::Errors::DmsfFileNotFoundError unless folder
+      raise DmsfFileNotFoundError unless folder
 
       zip.add_dmsf_folder folder, member, folder&.dmsf_folder&.dmsf_path_str
     end
     selected_files.each do |selected_file_id|
       file = DmsfFile.visible.find_by(id: selected_file_id)
-      unless file&.last_revision && File.exist?(file.last_revision&.disk_file)
-        raise RedmineDmsf::Errors::DmsfFileNotFoundError
-      end
+      raise DmsfFileNotFoundError unless file&.last_revision && File.exist?(file.last_revision&.disk_file)
+
       unless (file.project == @project) || User.current.allowed_to?(:view_dmsf_files, file.project)
-        raise RedmineDmsf::Errors::DmsfAccessError
+        raise DmsfAccessError
       end
 
       zip.add_dmsf_file file, member, file.dmsf_folder&.dmsf_path_str
     end
     max_files = RedmineDmsf.dmsf_max_file_download
-    raise RedmineDmsf::Errors::DmsfZipMaxFilesError if max_files.positive? && zip.dmsf_files.length > max_files
+    raise DmsfZipMaxFilesError if max_files.positive? && zip.dmsf_files.length > max_files
 
     zip
   end
@@ -595,19 +592,19 @@ class DmsfController < ApplicationController
     selected_folders.each do |id|
       folder = DmsfFolder.find_by(id: id)
 
-      raise RedmineDmsf::Errors::DmsfFileNotFoundError unless folder
+      raise DmsfFileNotFoundError unless folder
     end
     # Files
     selected_files.each do |id|
       file = DmsfFile.find_by(id: id)
-      raise RedmineDmsf::Errors::DmsfFileNotFoundError unless file
+      raise DmsfFileNotFoundError unless file
 
       flash[:error] = file.errors.full_messages.to_sentence unless file.restore
     end
     # Links
     selected_links.each do |id|
       link = DmsfLink.find_by(id: id)
-      raise RedmineDmsf::Errors::DmsfFileNotFoundError unless link
+      raise DmsfFileNotFoundError unless link
 
       flash[:error] = link.errors.full_messages.to_sentence unless link.restore
     end
@@ -616,20 +613,20 @@ class DmsfController < ApplicationController
   def delete_entries(selected_folders, selected_files, selected_links, commit)
     # Folders
     selected_folders.each do |id|
-      raise RedmineDmsf::Errors::DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
+      raise DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
 
       folder = DmsfFolder.find_by(id: id)
       if folder
         raise StandardError, folder.errors.full_messages.to_sentence unless folder.delete(commit: commit)
       elsif !commit
-        raise RedmineDmsf::Errors::DmsfFileNotFoundError
+        raise DmsfFileNotFoundError
       end
     end
     # Files
     deleted_files = []
     not_deleted_files = []
     if selected_files.any?
-      raise RedmineDmsf::Errors::DmsfAccessError unless User.current.allowed_to?(:file_delete, @project)
+      raise DmsfAccessError unless User.current.allowed_to?(:file_delete, @project)
 
       selected_files.each do |id|
         file = DmsfFile.find_by(id: id)
@@ -640,7 +637,7 @@ class DmsfController < ApplicationController
             not_deleted_files << file
           end
         elsif !commit
-          raise RedmineDmsf::Errors::DmsfFileNotFoundError
+          raise DmsfFileNotFoundError
         end
       end
     end
@@ -665,7 +662,7 @@ class DmsfController < ApplicationController
     end
     # Links
     if selected_links.any?
-      raise RedmineDmsf::Errors::DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
+      raise DmsfAccessError unless User.current.allowed_to?(:folder_manipulation, @project)
 
       selected_links.each do |id|
         link = DmsfLink.find_by(id: id)
@@ -699,11 +696,10 @@ class DmsfController < ApplicationController
 
   def move_entries(selected_folders, selected_files, selected_links)
     # Permissions
-    if selected_folders.any? && !User.current.allowed_to?(:folder_manipulation, @project)
-      raise RedmineDmsf::Errors::DmsfAccessError
-    end
+    raise DmsfAccessError if selected_folders.any? && !User.current.allowed_to?(:folder_manipulation, @project)
+
     if (selected_folders.any? || selected_links.any?) && !User.current.allowed_to?(:file_manipulation, @project)
-      raise RedmineDmsf::Errors::DmsfAccessError
+      raise DmsfAccessError
     end
 
     # Folders
@@ -826,27 +822,27 @@ class DmsfController < ApplicationController
       links = DmsfLink.where(id: @selected_links).to_a
       (folders + files + links).each do |entry|
         if entry.dmsf_folder
-          raise RedmineDmsf::Errors::DmsfParentError if entry.dmsf_folder == @target_folder || entry == @target_folder
+          raise DmsfParentError if entry.dmsf_folder == @target_folder || entry == @target_folder
         elsif @target_folder.nil?
-          raise RedmineDmsf::Errors::DmsfParentError if entry.project == @target_project
+          raise DmsfParentError if entry.project == @target_project
         end
       end
       # Prevent recursion
       if params[:move_entries].present?
         folders.each do |entry|
-          raise RedmineDmsf::Errors::DmsfParentError if entry.any_child?(@target_folder)
+          raise DmsfParentError if entry.any_child?(@target_folder)
         end
       end
       # Check permissions
       if (@target_folder && (@target_folder.locked_for_user? ||
          !DmsfFolder.permissions?(@target_folder, allow_system: false))) ||
          !@target_project.allows_to?(:folder_manipulation)
-        raise RedmineDmsf::Errors::DmsfAccessError
+        raise DmsfAccessError
       end
-    rescue RedmineDmsf::Errors::DmsfParentError
+    rescue DmsfParentError
       flash[:error] = l(:error_target_folder_same)
       redirect_back_or_default dmsf_folder_path(id: @project, folder_id: @folder)
-    rescue RedmineDmsf::Errors::DmsfAccessError
+    rescue DmsfAccessError
       render_403
     end
   end
diff --git a/app/controllers/dmsf_files_controller.rb b/app/controllers/dmsf_files_controller.rb
index e3c0a624..e2727472 100644
--- a/app/controllers/dmsf_files_controller.rb
+++ b/app/controllers/dmsf_files_controller.rb
@@ -49,7 +49,7 @@ class DmsfFilesController < ApplicationController
       @revision = @file.last_revision
     else
       @revision = DmsfFileRevision.find(params[:download].to_i)
-      raise RedmineDmsf::Errors::DmsfAccessError if @revision.dmsf_file != @file
+      raise DmsfAccessError if @revision.dmsf_file != @file
     end
 
     check_project @revision.dmsf_file
@@ -93,7 +93,7 @@ class DmsfFilesController < ApplicationController
                 type: @revision.detect_content_type,
                 disposition: params[:disposition].presence || @revision.dmsf_file.disposition
     end
-  rescue RedmineDmsf::Errors::DmsfAccessError => e
+  rescue DmsfAccessError => e
     Rails.logger.error e.message
     render_403
   rescue StandardError => e
@@ -378,6 +378,6 @@ class DmsfFilesController < ApplicationController
   def check_project(entry)
     return unless entry && entry.project != @project
 
-    raise RedmineDmsf::Errors::DmsfAccessError, l(:error_entry_project_does_not_match_current_project)
+    raise DmsfAccessError, l(:error_entry_project_does_not_match_current_project)
   end
 end
diff --git a/app/controllers/dmsf_folder_permissions_controller.rb b/app/controllers/dmsf_folder_permissions_controller.rb
index 9bf9d20b..0716490b 100644
--- a/app/controllers/dmsf_folder_permissions_controller.rb
+++ b/app/controllers/dmsf_folder_permissions_controller.rb
@@ -66,7 +66,7 @@ class DmsfFolderPermissionsController < ApplicationController
 
   def find_project
     @project = Project.visible.find_by_param(params[:project_id])
-  rescue RedmineDmsf::Errors::DmsfAccessError
+  rescue DmsfAccessError
     render_403
   rescue ActiveRecord::RecordNotFound
     render_404
@@ -74,7 +74,7 @@ class DmsfFolderPermissionsController < ApplicationController
 
   def find_folder
     @dmsf_folder = DmsfFolder.visible.find(params[:dmsf_folder_id])
-  rescue RedmineDmsf::Errors::DmsfAccessError
+  rescue DmsfAccessError
     render_403
   rescue ActiveRecord::RecordNotFound
     render_404
diff --git a/app/controllers/dmsf_upload_controller.rb b/app/controllers/dmsf_upload_controller.rb
index 35ef894a..5a515789 100644
--- a/app/controllers/dmsf_upload_controller.rb
+++ b/app/controllers/dmsf_upload_controller.rb
@@ -150,7 +150,7 @@ class DmsfUploadController < ApplicationController
 
   def find_folder
     @folder = DmsfFolder.visible.find(params[:folder_id]) if params.key?('folder_id')
-  rescue RedmineDmsf::Errors::DmsfAccessError
+  rescue DmsfAccessError
     render_403
   end
 end
diff --git a/app/controllers/dmsf_workflows_controller.rb b/app/controllers/dmsf_workflows_controller.rb
index a058b954..1cc32e8e 100644
--- a/app/controllers/dmsf_workflows_controller.rb
+++ b/app/controllers/dmsf_workflows_controller.rb
@@ -81,7 +81,7 @@ class DmsfWorkflowsController < ApplicationController
           if revision.dmsf_file
             begin
               revision.dmsf_file.unlock!(force_file_unlock_allowed: true) unless RedmineDmsf.dmsf_keep_documents_locked?
-            rescue RedmineDmsf::Errors::DmsfLockError => e
+            rescue DmsfLockError => e
               flash[:info] = e.message
             end
           end
@@ -225,7 +225,7 @@ class DmsfWorkflowsController < ApplicationController
                 if file
                   begin
                     file.lock!
-                  rescue RedmineDmsf::Errors::DmsfLockError => e
+                  rescue DmsfLockError => e
                     Rails.logger.warn e.message
                   end
                   flash[:notice] = l(:notice_successful_update)
diff --git a/lib/redmine_dmsf/errors/dmsf_access_error.rb b/app/errors/dmsf_access_error.rb
similarity index 87%
rename from lib/redmine_dmsf/errors/dmsf_access_error.rb
rename to app/errors/dmsf_access_error.rb
index e84f88fe..388ff2f6 100644
--- a/lib/redmine_dmsf/errors/dmsf_access_error.rb
+++ b/app/errors/dmsf_access_error.rb
@@ -18,11 +18,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # Access error
-    class DmsfAccessError < StandardError
-      # Nothing to do
-    end
-  end
+# Access error
+class DmsfAccessError < StandardError
+  # Nothing to do
 end
diff --git a/lib/redmine_dmsf/errors/dmsf_email_max_file_size_error.rb b/app/errors/dmsf_email_max_file_size_error.rb
similarity index 70%
rename from lib/redmine_dmsf/errors/dmsf_email_max_file_size_error.rb
rename to app/errors/dmsf_email_max_file_size_error.rb
index 3224199a..fd37c4bd 100644
--- a/lib/redmine_dmsf/errors/dmsf_email_max_file_size_error.rb
+++ b/app/errors/dmsf_email_max_file_size_error.rb
@@ -18,19 +18,15 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # max file size error
-    class DmsfEmailMaxFileSizeError < StandardError
-      include Redmine::I18n
+# Max file size error
+class DmsfEmailMaxFileSizeError < StandardError
+  include Redmine::I18n
 
-      def initialize(message = nil)
-        if message.present?
-          super
-        else
-          super(l(:error_max_email_filesize_exceeded, number: RedmineDmsf.dmsf_max_email_filesize))
-        end
-      end
+  def initialize(message = nil)
+    if message.present?
+      super
+    else
+      super(l(:error_max_email_filesize_exceeded, number: RedmineDmsf.dmsf_max_email_filesize))
     end
   end
 end
diff --git a/lib/redmine_dmsf/errors/dmsf_file_not_found_error.rb b/app/errors/dmsf_file_not_found_error.rb
similarity index 85%
rename from lib/redmine_dmsf/errors/dmsf_file_not_found_error.rb
rename to app/errors/dmsf_file_not_found_error.rb
index bc4244ab..53acd4d3 100644
--- a/lib/redmine_dmsf/errors/dmsf_file_not_found_error.rb
+++ b/app/errors/dmsf_file_not_found_error.rb
@@ -18,11 +18,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # Not found error
-    class DmsfFileNotFoundError < StandardError
-      # nothing to do
-    end
-  end
+# Not found error
+class DmsfFileNotFoundError < StandardError
+  # nothing to do
 end
diff --git a/lib/redmine_dmsf/errors/dmsf_lock_error.rb b/app/errors/dmsf_lock_error.rb
similarity index 87%
rename from lib/redmine_dmsf/errors/dmsf_lock_error.rb
rename to app/errors/dmsf_lock_error.rb
index 13ae8873..d9d893f0 100644
--- a/lib/redmine_dmsf/errors/dmsf_lock_error.rb
+++ b/app/errors/dmsf_lock_error.rb
@@ -18,11 +18,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # Lock error
-    class DmsfLockError < StandardError
-      # Nothing to do
-    end
-  end
+# Lock error
+class DmsfLockError < StandardError
+  # Nothing to do
 end
diff --git a/lib/redmine_dmsf/errors/dmsf_parent_error.rb b/app/errors/dmsf_parent_error.rb
similarity index 87%
rename from lib/redmine_dmsf/errors/dmsf_parent_error.rb
rename to app/errors/dmsf_parent_error.rb
index 39402731..00a766e0 100644
--- a/lib/redmine_dmsf/errors/dmsf_parent_error.rb
+++ b/app/errors/dmsf_parent_error.rb
@@ -18,11 +18,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # Parent error
-    class DmsfParentError < StandardError
-      # Nothing to do
-    end
-  end
+# Parent error
+class DmsfParentError < StandardError
+  # Nothing to do
 end
diff --git a/lib/redmine_dmsf/errors/dmsf_zip_max_files_error.rb b/app/errors/dmsf_zip_max_files_error.rb
similarity index 71%
rename from lib/redmine_dmsf/errors/dmsf_zip_max_files_error.rb
rename to app/errors/dmsf_zip_max_files_error.rb
index b715097a..35ae5810 100644
--- a/lib/redmine_dmsf/errors/dmsf_zip_max_files_error.rb
+++ b/app/errors/dmsf_zip_max_files_error.rb
@@ -18,19 +18,15 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
-module RedmineDmsf
-  module Errors
-    # File count exceeded
-    class DmsfZipMaxFilesError < StandardError
-      include Redmine::I18n
+# File count exceeded
+class DmsfZipMaxFilesError < StandardError
+  include Redmine::I18n
 
-      def initialize(message = nil)
-        if message.present?
-          super
-        else
-          super(l(:error_max_files_exceeded, number: RedmineDmsf.dmsf_max_file_download))
-        end
-      end
+  def initialize(message = nil)
+    if message.present?
+      super
+    else
+      super(l(:error_max_files_exceeded, number: RedmineDmsf.dmsf_max_file_download))
     end
   end
 end
diff --git a/app/helpers/dmsf_upload_helper.rb b/app/helpers/dmsf_upload_helper.rb
index 2bdef72b..1d6a7b86 100644
--- a/app/helpers/dmsf_upload_helper.rb
+++ b/app/helpers/dmsf_upload_helper.rb
@@ -130,7 +130,7 @@ module DmsfUploadHelper
           wf.notify_users project, new_revision, controller
           begin
             file.lock!
-          rescue RedmineDmsf::Errors::DmsfLockError => e
+          rescue DmsfLockError => e
             Rails.logger.warn e.message
           end
         else
diff --git a/app/models/dmsf_file_revision.rb b/app/models/dmsf_file_revision.rb
index 31f2064d..978fe004 100644
--- a/app/models/dmsf_file_revision.rb
+++ b/app/models/dmsf_file_revision.rb
@@ -196,7 +196,7 @@ class DmsfFileRevision < ApplicationRecord
   end
 
   def new_storage_filename
-    raise RedmineDmsf::Errors::DmsfAccessError, 'File id is not set' unless dmsf_file&.id
+    raise DmsfAccessError, 'File id is not set' unless dmsf_file&.id
 
     filename = DmsfHelper.sanitize_filename(name)
     timestamp = DateTime.current.strftime('%y%m%d%H%M%S')
diff --git a/lib/redmine_dmsf.rb b/lib/redmine_dmsf.rb
index cccf0ce2..4539dd40 100644
--- a/lib/redmine_dmsf.rb
+++ b/lib/redmine_dmsf.rb
@@ -277,15 +277,6 @@ after_easy_init do
   require "#{File.dirname(__FILE__)}/redmine_dmsf/webdav/resource_proxy"
 end
 
-# Errors
-after_easy_init do
-  require "#{File.dirname(__FILE__)}/redmine_dmsf/errors/dmsf_access_error"
-  require "#{File.dirname(__FILE__)}/redmine_dmsf/errors/dmsf_email_max_file_size_error"
-  require "#{File.dirname(__FILE__)}/redmine_dmsf/errors/dmsf_file_not_found_error"
-  require "#{File.dirname(__FILE__)}/redmine_dmsf/errors/dmsf_lock_error"
-  require "#{File.dirname(__FILE__)}/redmine_dmsf/errors/dmsf_zip_max_files_error"
-end
-
 # Hooks
 def require_hooks
   require "#{File.dirname(__FILE__)}/redmine_dmsf/hooks/controllers/account_controller_hooks"
diff --git a/lib/redmine_dmsf/dmsf_zip.rb b/lib/redmine_dmsf/dmsf_zip.rb
index ab26874e..f0b4a3ca 100644
--- a/lib/redmine_dmsf/dmsf_zip.rb
+++ b/lib/redmine_dmsf/dmsf_zip.rb
@@ -48,9 +48,7 @@ module RedmineDmsf
       end
 
       def add_dmsf_file(dmsf_file, member = nil, root_path = nil, path = nil)
-        unless dmsf_file&.last_revision && File.exist?(dmsf_file.last_revision.disk_file)
-          raise RedmineDmsf::Errors::DmsfFileNotFoundError
-        end
+        raise DmsfFileNotFoundError unless dmsf_file&.last_revision && File.exist?(dmsf_file.last_revision.disk_file)
 
         if path
           string_path = path
@@ -77,7 +75,7 @@ module RedmineDmsf
       def add_attachment(attachment, path)
         return if @files.include?(path)
 
-        raise RedmineDmsf::Errors::DmsfFileNotFoundError unless File.exist?(attachment.diskfile)
+        raise DmsfFileNotFoundError unless File.exist?(attachment.diskfile)
 
         zip_entry = ::Zip::Entry.new(@zip_file, path, nil, nil, nil, nil, nil, nil,
                                      ::Zip::DOSTime.at(attachment.created_on))
diff --git a/lib/redmine_dmsf/hooks/controllers/issues_controller_hooks.rb b/lib/redmine_dmsf/hooks/controllers/issues_controller_hooks.rb
index b2372a2c..3cb49cec 100644
--- a/lib/redmine_dmsf/hooks/controllers/issues_controller_hooks.rb
+++ b/lib/redmine_dmsf/hooks/controllers/issues_controller_hooks.rb
@@ -206,7 +206,7 @@ module RedmineDmsf
               wf.notify_users issue.project, revision, context[:controller]
               begin
                 file.lock!
-              rescue RedmineDmsf::Errors::DmsfLockError => e
+              rescue DmsfLockError => e
                 Rails.logger.warn e.message
               end
             else
diff --git a/lib/redmine_dmsf/lockable.rb b/lib/redmine_dmsf/lockable.rb
index 20c37454..07bc5fbe 100644
--- a/lib/redmine_dmsf/lockable.rb
+++ b/lib/redmine_dmsf/lockable.rb
@@ -44,15 +44,15 @@ module RedmineDmsf
     def lock!(scope = :scope_exclusive, type = :type_write, expire = nil, owner = nil)
       # Raise a lock error if entity is locked, but its not at resource level
       existing = lock(tree: false)
-      raise RedmineDmsf::Errors::DmsfLockError, l(:error_resource_or_parent_locked) if locked? && existing.empty?
+      raise DmsfLockError, l(:error_resource_or_parent_locked) if locked? && existing.empty?
 
       unless existing.empty?
         if (existing[0].lock_scope == :scope_shared) && (scope == :scope_shared)
           # RFC states if an item is exclusively locked and another lock is attempted we reject
           # if the item is shared locked however, we can always add another lock to it
-          raise RedmineDmsf::Errors::DmsfLockError, l(:error_parent_locked) if dmsf_folder.locked?
+          raise DmsfLockError, l(:error_parent_locked) if dmsf_folder.locked?
         elsif scope == :scope_exclusive
-          raise RedmineDmsf::Errors::DmsfLockError, l(:error_lock_exclusively)
+          raise DmsfLockError, l(:error_lock_exclusively)
         end
       end
       l = DmsfLock.new
@@ -107,19 +107,19 @@ module RedmineDmsf
     end
 
     def unlock!(force_file_unlock_allowed: false, owner: nil)
-      raise RedmineDmsf::Errors::DmsfLockError, l(:warning_file_not_locked) unless locked?
+      raise DmsfLockError, l(:warning_file_not_locked) unless locked?
 
       existing = lock(tree: true)
       destroyed = false
       # If its empty its a folder that's locked (not root)
       if existing.empty? || (!dmsf_folder.nil? && dmsf_folder.locked?)
-        raise RedmineDmsf::Errors::DmsfLockError, l(:error_unlock_parent_locked)
+        raise DmsfLockError, l(:error_unlock_parent_locked)
       end
 
       # If entity is locked to you, you aren't the lock originator (or named in a shared lock) so deny action
       # Unless of course you have the rights to force an unlock
       if locked_for_user? && !User.current.allowed_to?(:force_file_unlock, project) && !force_file_unlock_allowed
-        raise RedmineDmsf::Errors::DmsfLockError, l(:error_only_user_that_locked_file_can_unlock_it)
+        raise DmsfLockError, l(:error_only_user_that_locked_file_can_unlock_it)
       end
 
       # Now we need to determine lock type and do the needful
diff --git a/lib/redmine_dmsf/webdav/dmsf_resource.rb b/lib/redmine_dmsf/webdav/dmsf_resource.rb
index ecba00a7..31f4ad7f 100644
--- a/lib/redmine_dmsf/webdav/dmsf_resource.rb
+++ b/lib/redmine_dmsf/webdav/dmsf_resource.rb
@@ -493,7 +493,7 @@ module RedmineDmsf
           l = entity.lock!(scope, type, 1.week.from_now, args[:owner])
           @response['Lock-Token'] = l.uuid
           [1.week.to_i, l.uuid]
-        rescue RedmineDmsf::Errors::DmsfLockError => exception
+        rescue DmsfLockError => exception
           e = Dav4rack::LockFailure.new(exception.message)
           e.add_failure @path, Conflict
           raise e
diff --git a/patches/easy_crm_cases_controller_patch.rb b/patches/easy_crm_cases_controller_patch.rb
index 9dbc2242..25509faa 100644
--- a/patches/easy_crm_cases_controller_patch.rb
+++ b/patches/easy_crm_cases_controller_patch.rb
@@ -81,7 +81,7 @@ module RedmineDmsf
               wf.notify_users easy_crm_case.project, revision, self
               begin
                 file.lock!
-              rescue RedmineDmsf::Errors::DmsfLockError => e
+              rescue DmsfLockError => e
                 Rails.logger.warn e.message
               end
             else
diff --git a/test/unit/dmsf_lock_test.rb b/test/unit/dmsf_lock_test.rb
index 8ff59a81..824348bd 100644
--- a/test/unit/dmsf_lock_test.rb
+++ b/test/unit/dmsf_lock_test.rb
@@ -61,13 +61,13 @@ class DmsfLockTest < RedmineDmsf::Test::UnitTest
     @folder7.lock!
     User.current = nil
     assert_no_difference('@folder7.lock.count') do
-      assert_raise RedmineDmsf::Errors::DmsfLockError do
+      assert_raise DmsfLockError do
         @folder7.unlock!
       end
     end
     User.current = @jsmith
     assert_no_difference('@folder7.lock.count') do
-      assert_raise RedmineDmsf::Errors::DmsfLockError do
+      assert_raise DmsfLockError do
         @folder7.unlock!
       end
     end