Minkoff's Animated Battle System code problem

[Mikee]

I don't know if I'm posting in the right section.  This is my first time using scripts and I'm completely lost...

I've put in all 4 parts for the system, at first I had them in the wrong spot so it wouldn't let me run the game.  But now I've got that figured out. : )

Next I get an error saying... "'Minkoff_Miscellaneous' line 205: NoMethodError Occured.
                                        Undefined method ` /' for nil:NilClass"

Now... I'm extremely new.  Is there something I need to do beside just copy and paste the code?  I read through the pdf... but it seemed to me that unless I wanted to use something beside 11 pose battlers, or wanted to customize the linup, then I should just leave it be at the default.  Which is just fine with me.  So what am I doing wrong?

Here's the script (The line that starts with "x_spacer =..."  is #205.  The one where it says it has an error)

#--------------------------------------------------------------------------
  # * Actor X Coordinate
  #--------------------------------------------------------------------------
  def screen_x
    # Determine minimum horizontal space between battlers
    x_spacer = $game_system.form_wd / $game_system.max_member
    if self.index != nil
      case $game_system.formation
      when 0                                    # DIAGONAL PATTERN 1
        if $game_system.sv_angle == 1
          return self.index * -x_spacer + (($game_system.max_member+1)*x_spacer) #202        
        else
          return self.index * x_spacer + (640-(($game_system.max_member+1)*x_spacer))#450
        end          
      when 1                                    # DIAGONAL PATTERN 2   
        if $game_system.sv_angle == 1
          return self.index * x_spacer + x_spacer #64

HELP PLEASE!  :'(