Error with sensu using chef-client v 11

gistfile1.txt

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Recipe Compile Error in /var/chef/cache/cookbooks/sensu/libraries/json_file.rb
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NoMethodError
-------------
undefined method `attribute' for Chef::Resource::JsonFile:Class


Cookbook Trace:
---------------
  /var/chef/cache/cookbooks/sensu/libraries/json_file.rb:49:in `<class:JsonFile>'
  /var/chef/cache/cookbooks/sensu/libraries/json_file.rb:48:in `<top (required)>'


Relevant File Content:
----------------------
/var/chef/cache/cookbooks/sensu/libraries/json_file.rb:

 42:        set_group unless @new_resource.group.nil?
 43:        set_mode unless @new_resource.mode.nil?
 44:      end
 45:    end
 46:  end
 47:  
 48:  class Chef::Resource::JsonFile < Chef::Resource::File
 49>>   attribute :content, :kind_of => Hash
 50:  
 51:    def initialize(name, run_context=nil)
 52:      super
 53:      @resource_name = :json_file
 54:      @provider = Chef::Provider::JsonFile
 55:    end
 56:  end
 57: