diff --git a/app/models/venue_management_bill.rb b/app/models/venue_management_bill.rb
index 68b9741..e185155 100644
--- a/app/models/venue_management_bill.rb
+++ b/app/models/venue_management_bill.rb
@@ -2,6 +2,7 @@ require 'orbit_form_helper'
 class VenueManagementBill
   include Mongoid::Document
   include Mongoid::Timestamps
+  require 'mongoid/enum'
   include Mongoid::Enum
   BILLTYPE = {'venue_fee'=>["usage_fee", "royalties", "admin_fee", "land_rent"],'utility_bill'=>['electricity','water'],'tax'=>['house_tax','land_tax'],'prejudgment_interest'=>["usage_fee", "royalties", "admin_fee", "land_rent",'electricity','water','house_tax','land_tax','other'],'other'=>['penalty','other']}
   NOTFIELDKEY = ['float','fields','clear','no_margin','unit','display_title','display_unit','option_select']
diff --git a/app/models/venue_management_contract.rb b/app/models/venue_management_contract.rb
index b7e888d..a99ad24 100644
--- a/app/models/venue_management_contract.rb
+++ b/app/models/venue_management_contract.rb
@@ -5,6 +5,7 @@ require 'orbit_form_helper'
 class VenueManagementContract
   include Mongoid::Document
   include Mongoid::Timestamps
+  require 'mongoid/enum'
   include Mongoid::Enum
 
   PAYERS = [ :school, :vendor].freeze
diff --git a/app/models/venue_management_inviting.rb b/app/models/venue_management_inviting.rb
index 4824618..56c71cd 100644
--- a/app/models/venue_management_inviting.rb
+++ b/app/models/venue_management_inviting.rb
@@ -5,6 +5,7 @@ require 'orbit_form_helper'
 class VenueManagementInviting
   include Mongoid::Document
   include Mongoid::Timestamps
+  require 'mongoid/enum'
   include Mongoid::Enum
   include OrbitTag::Taggable
   PAYERS = [ :school, :vendor].freeze
diff --git a/app/models/venue_management_memorabilia.rb b/app/models/venue_management_memorabilia.rb
index befe29a..ae72add 100644
--- a/app/models/venue_management_memorabilia.rb
+++ b/app/models/venue_management_memorabilia.rb
@@ -1,6 +1,7 @@
 class VenueManagementMemorabilia
   include Mongoid::Document
   include Mongoid::Timestamps
+  require 'mongoid/enum'
   include Mongoid::Enum
 
   field :event_date, type: Date, default: Time.now
diff --git a/venue_management.gemspec b/venue_management.gemspec
index f4c09fb..11078fe 100644
--- a/venue_management.gemspec
+++ b/venue_management.gemspec
@@ -4,7 +4,7 @@
 Gem::Specification.new do |s|
   s.name = "venue_management"
   s.version = "0.0.1"
-
+  s.add_dependency 'mongoid-enum'
   s.authors = ["chiu"]
   s.description = "Venue Management plugin."
   s.email = ["naruto0426@rulingcom.com"]