Fixed for initial setup.

db/migrate/20140608000002_update_ticket_replace2.rb

@@ -1,8 +1,9 @@
 class UpdateTicketReplace2 < ActiveRecord::Migration
   def up
+    overview_role = Role.where( :name => 'Agent' ).first
+    if overview_role
       Overview.destroy_all
       UserInfo.current_user_id = 1
-overview_role = Role.where( :name => 'Agent' ).first
       Overview.create_if_not_exists(
         :name       => 'My assigned Tickets',
         :link       => 'my_assigned',
@@ -169,7 +170,7 @@ Overview.create_if_not_exists(
           :view_mode_default => 's',
         },
       )
-
+    end
   end
 
   def down