uninitialized constant Administrate::Generators::InstallGenerator::DashboardManifest

Created by: frabrunelle

Hi 😃

When I run the installer for Administrate, I get the following error:

rails generate administrate:install
Running via Spring preloader in process 33128
      create  app/controllers/admin/application_controller.rb
       route  namespace :admin do
    DashboardManifest::DASHBOARDS.each do |dashboard_resource|
      resources dashboard_resource
    end

    root controller: DashboardManifest::ROOT_DASHBOARD, action: :index
  end
      create  app/dashboards/dashboard_manifest.rb
/usr/local/lib/ruby/gems/2.3.0/gems/administrate-0.1.3/lib/generators/administrate/install/install_generator.rb:44:in `manifest': uninitialized constant Administrate::Generators::InstallGenerator::DashboardManifest (NameError)
    from /usr/local/lib/ruby/gems/2.3.0/gems/administrate-0.1.3/lib/generators/administrate/install/install_generator.rb:36:in `dashboard_resources'
    from /usr/local/lib/ruby/gems/2.3.0/gems/administrate-0.1.3/lib/generators/administrate/install/install_generator.rb:32:in `singular_dashboard_resources'
    from /usr/local/lib/ruby/gems/2.3.0/gems/administrate-0.1.3/lib/generators/administrate/install/install_generator.rb:24:in `run_dashboard_generators'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `block in invoke_all'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `each'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `map'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `invoke_all'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/group.rb:232:in `dispatch'
    from /usr/local/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/generators.rb:157:in `invoke'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands/generate.rb:13:in `<top (required)>'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:123:in `require_command!'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:130:in `generate_or_destroy'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:50:in `generate'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /usr/local/lib/ruby/gems/2.3.0/gems/railties-4.2.5/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/frabrunelle/administrate/bin/rails:9:in `<top (required)>'
    from /usr/local/Cellar/ruby/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /usr/local/Cellar/ruby/2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from -e:1:in `<main>'

Is anyone else getting this error? I get this error even on a totally new Rails application, so it should be pretty easy to reproduce.