can access active admin/users on local but not production - heroku

Question

ok so I can get to active admin on local and my site just fine - within active admin I have the options to select from Pins or Users (my two models) on local, can see all of the pins and users in the db just fine. However, live (heroku) I can access active admin barnpix.com/admin and clicking on pins works just fine ..however when I click users I get a generic heroku error... please help why does this work in local but not live?
Omrails::Application.routes.draw do
get "pages/tagz"
get "pages/about"
get "posts/show"
get "posts/destroy"
root :to => 'pins#index'
get 'tags/:tag' , to: 'pins#index', as: :tag
get "posts", to: "posts#index"
resources :posts
resources :pins
get "users/show"
devise_for :users
match 'users/:id' => 'users#show', as: :user
ActiveAdmin.routes(self)
devise_for :admin_users, ActiveAdmin::Devise.config
ActiveAdmin.routes(self)
devise_for :views
ActiveAdmin.routes(self)
ActiveAdmin.setup do |config|
# == Site Title
#
# Set the title that is displayed on the main layout
# for each of the active admin pages.
#
config.site_title = "BarnPix.com"
# Set the link url for the title. For example, to take
# users to your main site. Defaults to no link.
#
config.site_title_link = "http://www.barnpix.com"
# Set an optional image to be displayed for the header
# instead of a string (overrides :site_title)
#
# Note: Recommended image height is 21px to properly fit in the header
#
# config.site_title_image = "/images/logo.png"
# == Default Namespace
#
# Set the default namespace each administration resource
# will be added to.
#
# eg:
# config.default_namespace = :hello_world
#
# This will create resources in the HelloWorld module and
# will namespace routes to /hello_world/*
#
# To set no namespace by default, use:
# config.default_namespace = false
#
# Default:
# config.default_namespace = :admin
#
# You can customize the settings for each namespace by using
# a namespace block. For example, to change the site title
# within a namespace:
#
# config.namespace :admin do |admin|
# admin.site_title = "Custom Admin Title"
# end
#
# This will ONLY change the title for the admin section. Other
# namespaces will continue to use the main "site_title" configuration.
# == User Authentication
#
# Active Admin will automatically call an authentication
# method in a before filter of all controller actions to
# ensure that there is a currently logged in admin user.
#
# This setting changes the method which Active Admin calls
# within the controller.
config.authentication_method = :authenticate_admin_user!
# == Current User
#
# Active Admin will associate actions with the current
# user performing them.
#
# This setting changes the method which Active Admin calls
# to return the currently logged in user.
config.current_user_method = :current_admin_user
# == Logging Out
#
# Active Admin displays a logout link on each screen. These
# settings configure the location and method used for the link.
#
# This setting changes the path where the link points to. If it's
# a string, the strings is used as the path. If it's a Symbol, we
# will call the method to return the path.
#
# Default:
config.logout_link_path = :destroy_admin_user_session_path
# This setting changes the http method used when rendering the
# link. For example :get, :delete, :put, etc..
#
# Default:
# config.logout_link_method = :get
# == Root
#
# Set the action to call for the root path. You can set different
# roots for each namespace.
#
# Default:
# config.root_to = 'dashboard#index'
# == Admin Comments
#
# Admin comments allow you to add comments to any model for admin use.
# Admin comments are enabled by default.
#
# Default:
# config.allow_comments = true
#
# You can turn them on and off for any given namespace by using a
# namespace config block.
#
# Eg:
# config.namespace :without_comments do |without_comments|
# without_comments.allow_comments = false
# end
# == Batch Actions
#
# Enable and disable Batch Actions
#
config.batch_actions = true
# == Controller Filters
#
# You can add before, after and around filters to all of your
# Active Admin resources and pages from here.
#
# config.before_filter :do_something_awesome
# == Register Stylesheets & Javascripts
#
# We recommend using the built in Active Admin layout and loading
# up your own stylesheets / javascripts to customize the look
# and feel.
#
# To load a stylesheet:
# config.register_stylesheet 'my_stylesheet.css'
# You can provide an options hash for more control, which is passed along to stylesheet_link_tag():
# config.register_stylesheet 'my_print_stylesheet.css', :media => :print
#
# To load a javascript file:
# config.register_javascript 'my_javascript.js'
# == CSV options
#
# Set the CSV builder separator (default is ",")
# config.csv_column_separator = ','
#
# Set the CSV builder options (default is {})
# config.csv_options = {}
# == Menu System
#
# You can add a navigation menu to be used in your application, or configure a provided menu
#
# To change the default utility navigation to show a link to your website & a logout btn
#
# config.namespace :admin do |admin|
# admin.build_menu :utility_navigation do |menu|
# menu.add label: "My Great Website", url: "http://www.mygreatwebsite.com", html_options: { target: :blank }
# admin.add_logout_button_to_menu menu
# end
# end
#
# If you wanted to add a static menu item to the default menu provided:
#
# config.namespace :admin do |admin|
# admin.build_menu :default do |menu|
# menu.add label: "My Great Website", url: "http://www.mygreatwebsite.com", html_options: { target: :blank }
# end
# end
# == Download Links
#
# You can disable download links on resource listing pages,
# or customize the formats shown per namespace/globally
#
# To disable/customize for the :admin namespace:
#
# config.namespace :admin do |admin|
#
# # Disable the links entirely
# admin.download_links = false
#
# # Only show XML & PDF options
# admin.download_links = [:xml, :pdf]
#
# end
# == Pagination
#
# Pagination is enabled by default for all resources.
# You can control the default per page count for all resources here.
#
#config.default_per_page = 30
# == Filters
#
# By default the index screen includes a “Filters” sidebar on the right
# hand side with a filter for each attribute of the registered model.
# You can enable or disable them for all resources here.
#
# config.filters = true
end