Getting more then one attack off. (Ccoa's side view system)

[Dko]

I guess since my last post got no reply ill try a different approach to my problem. I want to try to have it so based on a characters statistic that selected character in battle can make more then one attack of different powers. (Sorta like Chrono Cross)
Now ive had it for a while where pressing certain keys caused the different damage to be dealt but I can't seam to get the multiple attacks to work. SO I was wondering if anyone could share some ideas on how I would get this to work?

because this bellow doesn't work. There are no errors. It just acts like I never changed my code at all to try for multiple attacks.

#--------------------------------------------------------------------------
  # * Frame Update (actor command phase : enemy selection)
  #--------------------------------------------------------------------------
 def update_phase3_enemy_select
    # Update enemy arrow
    @enemy_arrow.update
    # If B button was pressed
    if Input.trigger?(Input::B)
      # Play cancel SE
      $game_system.se_play($data_system.cancel_se)
      # End enemy selection
      end_enemy_select
      return
    end
    
    # If C button was pressed
    if Input.trigger?(Input::C) or Input.trigger?(Input::Y) or Input.trigger?(Input::X) or Input.trigger?(Input::Z)
      # Play decision SE
      $game_system.se_play($data_system.decision_se)
      # Set action
      if @active_battler.is_a?(Game_Actor)
        @num_attacks = @active_battler.stam
      else
        @num_attacks = 1
      end
      # Set each attacks strength
      for i in (1..@num_attacks)
        
        if Input.trigger?(Input::C) or Input.trigger?(Input::Y)
          $atk_power[i] = "MED"
        end
        if Input.trigger?(Input::X)
          $atk_power[i] = "STR"
        end
        if Input.trigger?(Input::Z)
          $atk_power[i] = "WEAK"
        end
      end

 

[Dko]

EDIT: Well ive narrowed things down and changed some of my code. But now im getting an error.
Script 'CBS Game_Battler' line 52: NoMethodError occurred.
undefined method '[]=' for nil:NilClass

Which for some reason is caused by this line code..

for i in (1..@num_attacks)
      # First hit detection
      hit_result = (rand(100) < attacker.hit)
      # If hit occurs
      if hit_result == true
        # Calculate basic damage    
          atk = [attacker.ap * 4 * (1 - self.pdef/255), 0].max
          self.damage[i] = atk # this line is the problem.

For some reason trying to change damage to a array is causing it and I can't remember what is the cause of this kind of error. Could I get a refresher as to what that is?

 

[Dko]

One last bump T_T