Transfer hash (within a class) to another class

I got a problem running the following codes:
--------------------------------------------------------------------------
class Environmental
  def display
    convert_yaml = YAML::load_file('nizam.yaml')
    pp convert_yaml["System"]["Environmental"]["children"]
  end
end

class EnergyManagement < Environmental
  def display(nizam)
    convert_yaml = YAML::load_file('nizam.yaml')
    @nizam = nizam
    convert_yaml["System"]["Environmental"]["children"][2]["children"]
<< @nizam

    File.open("nizam_out.yaml", "w"){|f| YAML.dump(convert_yaml, f)}

  end
end

class Efficiency <
  Struct.new(:issue, :blank, :risk_opportunity, :compliance,
:consequence, :current_status, :due_date, :priority, :responsibility,
:probability)
  # a method to print out a csv record for the current Person.

  def print_csv_record
    #.....few lines of codes here. Not relevant to the problem i think
    #.....few lines of codes here

  def convert_ruby_struct
    afiq = {"name"=>"#{blank}", #assume #{blank} is just a normal string
           "type"=>"Objective",
           "subtype"=>"None",
           "components"=>
            [{"type"=>"ContentBox",
              "title"=>"Audit",
              "args"=>{:content=>"None\n"}},
             {"type"=>"ChildListingComponent",
              "title"=>"Current Targets for the #{blank} Objective:"}]}
  pp afiq
  e = EnergyManagement.new(afiq)
  e.display
  end
end
--------------------------------------------------------------------------
Then i got this error:

rb:18:in `display': wrong number of arguments (0 for 1) (ArgumentError)

I know the problem is regarding on inserting 'afiq' into display method
under EnergyManagement class but do not know how to solve it. Anyone
knows how to transfer hash into another class?

I know im posting two different threads at the same time because i am
working with these two problems simultaneously. Sorry for this confusion

Nizam

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