Adding a second image to a gallery causes an error about refinerycms-portfolio HOT 5 CLOSED

GIT
  remote: git://github.com/refinery/refinerycms-portfolio.git
  revision: 858196e492801aa6712634161fb5a33eb5541438
  branch: master
  specs:
    refinerycms-portfolio (3.0.0)
      friendly_id (~> 5.1.0)
      friendly_id-globalize (>= 1.0.0.alpha2)
      globalize (>= 4.0.0, < 5.2)
      refinerycms-acts-as-indexed (~> 2.0.0)
      refinerycms-core (~> 3.0.0)

GIT
  remote: https://github.com/refinery/refinerycms
  revision: 39768eb0534a094652aba68f9519e7aa9d50d4fc
  branch: master
  specs:
    refinerycms (3.0.0)
      refinerycms-core (= 3.0.0)
      refinerycms-images (= 3.0.0)
      refinerycms-pages (= 3.0.0)
      refinerycms-resources (= 3.0.0)
    refinerycms-core (3.0.0)
      actionpack (>= 4.2.3, < 5.0)
      activerecord (>= 4.2.3, < 5.0)
      awesome_nested_set (~> 3.0.0)
      coffee-rails (~> 4.0, >= 4.0.0)
      decorators (~> 2.0.0)
      jquery-rails (>= 2.3.0)
      jquery-ui-rails (~> 5.0.0)
      railties (>= 4.2.3, < 5.0)
      refinerycms-i18n (~> 3.0.0)
      sass-rails (>= 4.0, < 5.1)
      truncate_html (~> 0.9)
      will_paginate (~> 3.0.2)
      zilch-authorisation
    refinerycms-images (3.0.0)
      dragonfly (~> 1.0.0)
      globalize (>= 4.0.0, < 5.2)
      refinerycms-core (= 3.0.0)
    refinerycms-pages (3.0.0)
      awesome_nested_set (~> 3.0.0)
      babosa (!= 0.3.6)
      friendly_id (~> 5.1.0)
      globalize (>= 4.0.0, < 5.2)
      refinerycms-core (= 3.0.0)
      seo_meta (~> 2.0.0.rc.1)
      speakingurl-rails (~> 1.1.2)
    refinerycms-resources (3.0.0)
      acts_as_indexed (~> 0.8.0)
      dragonfly (~> 1.0.0)
      globalize (>= 4.0.0, < 5.2)
      refinerycms-core (= 3.0.0)

GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.2.4)
      actionpack (= 4.2.4)
      actionview (= 4.2.4)
      activejob (= 4.2.4)
      mail (~> 2.5, >= 2.5.4)
      rails-dom-testing (~> 1.0, >= 1.0.5)
    actionpack (4.2.4)
      actionview (= 4.2.4)
      activesupport (= 4.2.4)
      rack (~> 1.6)
      rack-test (~> 0.6.2)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    actionview (4.2.4)
      activesupport (= 4.2.4)
      builder (~> 3.1)
      erubis (~> 2.7.0)
      rails-dom-testing (~> 1.0, >= 1.0.5)
      rails-html-sanitizer (~> 1.0, >= 1.0.2)
    activejob (4.2.4)
      activesupport (= 4.2.4)
      globalid (>= 0.3.0)
    activemodel (4.2.4)
      activesupport (= 4.2.4)
      builder (~> 3.1)
    activerecord (4.2.4)
      activemodel (= 4.2.4)
      activesupport (= 4.2.4)
      arel (~> 6.0)
    activesupport (4.2.4)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    acts_as_indexed (0.8.3)
    addressable (2.3.8)
    arel (6.0.3)
    awesome_nested_set (3.0.2)
      activerecord (>= 4.0.0, < 5)
    babosa (1.0.2)
    bcrypt (3.1.10)
    binding_of_caller (0.7.2)
      debug_inspector (>= 0.0.1)
    builder (3.2.2)
    byebug (6.0.2)
    coffee-rails (4.1.0)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.4.1)
      coffee-script-source
      execjs
    coffee-script-source (1.9.1.1)
    debug_inspector (0.0.2)
    decorators (2.0.1)
      railties (>= 4.0.0, < 5.0.0)
    devise (3.5.2)
      bcrypt (~> 3.0)
      orm_adapter (~> 0.1)
      railties (>= 3.2.6, < 5)
      responders
      thread_safe (~> 0.1)
      warden (~> 1.2.3)
    dragonfly (1.0.12)
      addressable (~> 2.3)
      multi_json (~> 1.0)
      rack (>= 1.3.0)
    erubis (2.7.0)
    execjs (2.6.0)
    friendly_id (5.1.0)
      activerecord (>= 4.0.0)
    friendly_id-globalize (1.0.0.alpha2)
      friendly_id (~> 5.1.0, < 6.0)
    globalid (0.3.6)
      activesupport (>= 4.1.0)
    globalize (5.0.1)
      activemodel (>= 4.2.0, < 4.3)
      activerecord (>= 4.2.0, < 4.3)
    i18n (0.7.0)
    jbuilder (2.3.1)
      activesupport (>= 3.0.0, < 5)
      multi_json (~> 1.2)
    jquery-rails (4.0.5)
      rails-dom-testing (~> 1.0)
      railties (>= 4.2.0)
      thor (>= 0.14, < 2.0)
    jquery-ui-rails (5.0.5)
      railties (>= 3.2.16)
    json (1.8.3)
    loofah (2.0.3)
      nokogiri (>= 1.5.9)
    mail (2.6.3)
      mime-types (>= 1.16, < 3)
    mime-types (2.6.2)
    mini_portile (0.6.2)
    minitest (5.8.1)
    multi_json (1.11.2)
    nokogiri (1.6.6.2)
      mini_portile (~> 0.6.0)
    orm_adapter (0.5.0)
    quiet_assets (1.1.0)
      railties (>= 3.1, < 5.0)
    rack (1.6.4)
    rack-test (0.6.3)
      rack (>= 1.0)
    rails (4.2.4)
      actionmailer (= 4.2.4)
      actionpack (= 4.2.4)
      actionview (= 4.2.4)
      activejob (= 4.2.4)
      activemodel (= 4.2.4)
      activerecord (= 4.2.4)
      activesupport (= 4.2.4)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.2.4)
      sprockets-rails
    rails-deprecated_sanitizer (1.0.3)
      activesupport (>= 4.2.0.alpha)
    rails-dom-testing (1.0.7)
      activesupport (>= 4.2.0.beta, < 5.0)
      nokogiri (~> 1.6.0)
      rails-deprecated_sanitizer (>= 1.0.1)
    rails-html-sanitizer (1.0.2)
      loofah (~> 2.0)
    rails-i18n (4.0.5)
      i18n (~> 0.6)
      railties (~> 4.0)
    railties (4.2.4)
      actionpack (= 4.2.4)
      activesupport (= 4.2.4)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.4.2)
    rdoc (4.2.0)
      json (~> 1.4)
    refinerycms-acts-as-indexed (2.0.1)
      acts_as_indexed (~> 0.8.0)
      decorators (~> 2.0.0)
      refinerycms-core (~> 3.0.0)
    refinerycms-authentication-devise (1.0.4)
      actionmailer (~> 4.2, >= 4.2.0)
      devise (~> 3.0, >= 3.2.4)
      friendly_id (~> 5.1.0)
      refinerycms-core (~> 3.0, >= 3.0.0)
    refinerycms-i18n (3.0.1)
      rails-i18n (~> 4.0.1)
      routing-filter (>= 0.4.0)
    refinerycms-wymeditor (1.0.6)
      refinerycms-core (~> 3.0, >= 3.0.0)
    responders (2.1.0)
      railties (>= 4.2.0, < 5)
    routing-filter (0.5.1)
      actionpack (~> 4.2)
      activesupport (~> 4.2)
    sass (3.4.18)
    sass-rails (5.0.4)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.1)
      sprockets (>= 2.8, < 4.0)
      sprockets-rails (>= 2.0, < 4.0)
      tilt (>= 1.1, < 3)
    sdoc (0.4.1)
      json (~> 1.7, >= 1.7.7)
      rdoc (~> 4.0)
    seo_meta (2.0.0.rc.1)
      railties (>= 3.0.0)
    speakingurl-rails (1.1.5)
      railties (>= 3.1)
    spring (1.4.0)
    sprockets (3.3.5)
      rack (> 1, < 3)
    sprockets-rails (2.3.3)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (>= 2.8, < 4.0)
    sqlite3 (1.3.10)
    thor (0.19.1)
    thread_safe (0.3.5)
    tilt (2.0.1)
    truncate_html (0.9.3)
    turbolinks (2.5.3)
      coffee-rails
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    uglifier (2.7.2)
      execjs (>= 0.3.0)
      json (>= 1.8.0)
    warden (1.2.3)
      rack (>= 1.0)
    web-console (2.2.1)
      activemodel (>= 4.0)
      binding_of_caller (>= 0.7.2)
      railties (>= 4.0)
      sprockets-rails (>= 2.0, < 4.0)
    will_paginate (3.0.7)
    zilch-authorisation (0.0.1)

PLATFORMS
  ruby

DEPENDENCIES
  byebug
  coffee-rails (~> 4.1.0)
  jbuilder (~> 2.0)
  jquery-rails
  quiet_assets
  rails (= 4.2.4)
  refinerycms!
  refinerycms-acts-as-indexed (~> 2.0, >= 2.0.0)
  refinerycms-authentication-devise (~> 1.0)
  refinerycms-portfolio!
  refinerycms-wymeditor (~> 1.0, >= 1.0.6)
  sass-rails (~> 5.0)
  sdoc (~> 0.4.0)
  spring
  sqlite3
  turbolinks
  uglifier (>= 1.3.0)
  web-console (~> 2.0)

activerecord (4.2.4) lib/active_record/relation/delegation.rb:132:in `sort_by'
activerecord (4.2.4) lib/active_record/relation/delegation.rb:132:in `public_send'
activerecord (4.2.4) lib/active_record/relation/delegation.rb:132:in `method_missing'
activerecord (4.2.4) lib/active_record/relation/delegation.rb:99:in `method_missing'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/models/refinery/portfolio/gallery.rb:31:in `cover_image'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/views/refinery/portfolio/galleries/_gallery.html.erb:3:in `block in ___sers_walterwindrich__rbenv_versions_______lib_ruby_gems_______bundler_gems_refinerycms_portfolio_______e______app_views_refinery_portfolio_galleries__gallery_html_erb__4110316288670385100_70217581308620'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:202:in `with_output_buffer'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:38:in `capture'
actionview (4.2.4) lib/action_view/helpers/tag_helper.rb:106:in `content_tag'
actionview (4.2.4) lib/action_view/helpers/url_helper.rb:184:in `link_to'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/views/refinery/portfolio/galleries/_gallery.html.erb:2:in `___sers_walterwindrich__rbenv_versions_______lib_ruby_gems_______bundler_gems_refinerycms_portfolio_______e______app_views_refinery_portfolio_galleries__gallery_html_erb__4110316288670385100_70217581308620'
actionview (4.2.4) lib/action_view/template.rb:145:in `block in render'
activesupport (4.2.4) lib/active_support/notifications.rb:166:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:333:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:143:in `render'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:436:in `block in collection_with_template'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:432:in `map'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:432:in `collection_with_template'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:324:in `render_collection'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:306:in `block in render'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:305:in `render'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:47:in `render_partial'
actionview (4.2.4) lib/action_view/helpers/rendering_helper.rb:35:in `render'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/views/refinery/portfolio/galleries/_galleries.html.erb:3:in `___sers_walterwindrich__rbenv_versions_______lib_ruby_gems_______bundler_gems_refinerycms_portfolio_______e______app_views_refinery_portfolio_galleries__galleries_html_erb___1809525697009209194_70217581361760'
actionview (4.2.4) lib/action_view/template.rb:145:in `block in render'
activesupport (4.2.4) lib/active_support/notifications.rb:166:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:333:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:143:in `render'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:339:in `render_partial'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:310:in `block in render'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument'
actionview (4.2.4) lib/action_view/renderer/partial_renderer.rb:309:in `render'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:47:in `render_partial'
actionview (4.2.4) lib/action_view/helpers/rendering_helper.rb:35:in `render'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/views/refinery/portfolio/galleries/index.html.erb:4:in `block in ___sers_walterwindrich__rbenv_versions_______lib_ruby_gems_______bundler_gems_refinerycms_portfolio_______e______app_views_refinery_portfolio_galleries_index_html_erb___3457018403270128575_70217571318780'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:38:in `block in capture'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:202:in `with_output_buffer'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:38:in `capture'
actionview (4.2.4) lib/action_view/helpers/capture_helper.rb:152:in `content_for'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-portfolio-858196e49280/app/views/refinery/portfolio/galleries/index.html.erb:1:in `___sers_walterwindrich__rbenv_versions_______lib_ruby_gems_______bundler_gems_refinerycms_portfolio_______e______app_views_refinery_portfolio_galleries_index_html_erb___3457018403270128575_70217571318780'
actionview (4.2.4) lib/action_view/template.rb:145:in `block in render'
activesupport (4.2.4) lib/active_support/notifications.rb:166:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:333:in `instrument'
actionview (4.2.4) lib/action_view/template.rb:143:in `render'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:54:in `block (2 levels) in render_template'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionview (4.2.4) lib/action_view/renderer/abstract_renderer.rb:39:in `instrument'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:53:in `block in render_template'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:61:in `render_with_layout'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:52:in `render_template'
actionview (4.2.4) lib/action_view/renderer/template_renderer.rb:14:in `render'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:42:in `render_template'
actionview (4.2.4) lib/action_view/renderer/renderer.rb:23:in `render'
actionview (4.2.4) lib/action_view/rendering.rb:100:in `_render_template'
actionpack (4.2.4) lib/action_controller/metal/streaming.rb:217:in `_render_template'
actionview (4.2.4) lib/action_view/rendering.rb:83:in `render_to_body'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:32:in `render_to_body'
actionpack (4.2.4) lib/action_controller/metal/renderers.rb:37:in `render_to_body'
actionpack (4.2.4) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:44:in `block (2 levels) in render'
activesupport (4.2.4) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/2.1.0/benchmark.rb:294:in `realtime'
activesupport (4.2.4) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:44:in `block in render'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:87:in `cleanup_view_runtime'
activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:43:in `render'
/Users/walterwindrich/.rbenv/versions/2.1.3/lib/ruby/gems/2.1.0/bundler/gems/refinerycms-39768eb0534a/pages/lib/refinery/pages/instance_methods.rb:21:in `render'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (4.2.4) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.4) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.4) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.4) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.4) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.2.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.4) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.4) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.4) lib/action_controller/metal.rb:196:in `dispatch'
actionpack (4.2.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
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