NoMethodError in Socials#index

Showing vendor/plugins/theme_fastpointgames/app/views/user/league/_commish_notes.erb where line #2 raised:

undefined method `fragment_cache_key' for #<ActionView::Base:0x2e18f514>

Extracted source (around line #2):

1: <% cache "commish_note_#{@league.id}" do %>
2: 	<%=  fragment_cache_key("commish_note_#{@league.id}") %>
3: 	<%= fragment_exist?("commish_note_#{@league.id}") %>
4: 	<% if @league.respond_to? :commish_notes_body and !@league.commish_notes_body.nil? %>
5: 	    <!-- <portlet> -->

Trace of template inclusion: vendor/plugins/theme_fastpointgames/app/views/socials/dashboard.html.erb

RAILS_ROOT: D:/lifelogger/scp
Application Trace | Framework Trace | Full Trace

D:/lifelogger/scp/vendor/plugins/theme_fastpointgames/app/views/user/league/_commish_notes.erb:2:in `_run_erb_vendor47plugins47theme_fastpointgames47app47views47user47league47_commish_notes46erb_locals_commish_notes_object'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/caching/fragments.rb:43:in `call'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/caching/fragments.rb:43:in `fragment_for'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/helpers/cache_helper.rb:35:in `cache'
D:/lifelogger/scp/vendor/plugins/theme_fastpointgames/app/views/user/league/_commish_notes.erb:1:in `_run_erb_vendor47plugins47theme_fastpointgames47app47views47user47league47_commish_notes46erb_locals_commish_notes_object'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `send'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `render'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:306:in `with_template'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable.rb:30:in `render'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable_partial.rb:20:in `render'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:26:in `benchmark'
C:/Ruby186/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
C:/Ruby186/lib/ruby/1.8/benchmark.rb:308:in `realtime'
C:/Ruby186/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/core_ext/benchmark.rb:17:in `ms'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_controller/benchmarking.rb:26:in `benchmark'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable_partial.rb:19:in `render'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/template.rb:205:in `render_template'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable_partial.rb:44:in `render_partial'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/partials.rb:184:in `render_partial'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:267:in `render'
D:/lifelogger/scp/vendor/plugins/theme_fastpointgames/app/views/socials/dashboard.html.erb:98:in `_run_erb_vendor47plugins47theme_fastpointgames47app47views47socials47dashboard46html46erb'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `send'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/renderable.rb:34:in `render'
C:/Ruby186/lib/ruby/gems/1.8/gems/actionpack-2.3.8/lib/action_view/base.rb:306:in `with_template