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I'm writing a lite script for granting skills from equiped items(yes I know there is one here already but I need the practice)

So I start my game and it runs fine, except when i go to change equipment, it says

Line 52 of the Module
Undefined Method 'equip_set=' for (insert actor hex address)

Anyways here's the code relating to my error...

[spoiler]
Game_Actor

class Game_Actor < Game_Battler

 attr_accessor :last_skill_set               # Copy current skills for updates
 attr_accessor :skill_set                    # Current set of skills
 attr_accessor :equip_set                    # Array of Equipment IDs   # Right here, doesn't this define it?
 attr_accessor :last_equip_set               # Copy of Equipment IDs for updates
 
 alias SGE_initialize initialize
 def initialize(actor_id)
   SGE_initialize(actor_id)
   @actor= $data_actors[actor_id]
   @skill_set= Array.new(5, Array.new)
   @last_skill_set= Array.new(5, Array.new)
   @equip_set= Array.new(5)         # Here too, am I doing anything wrong?
   @last_equip_set= Array.new(5)
 end



Module

module SKRenSGE
 #==========================================================================#
 # ** Skill Index:                                                          #
 #--------------------------------------------------------------------------#
 #   This is where you set up what skill are given by which equipment.      #
 #   The format is:                                                         #
 #   {Equip ID 1=> [Skill ID 1, Skill ID 2,..., Skill ID N],..., Equip ID N}#
 #   Place all skills within the array you want to be granted by the        #
 #   corresponding equipment.                                               #
 #==========================================================================#
 #--------------------------------------------------------------------------#
 #--------------------------------------------------------------------------#

 SKILL_INDEX_WEAPON= {1=>[2,3,4,5,6]}
 SKILL_INDEX_ARMOR= {}
 
 def self.skill_index(actor)
   for i in 0..4
     if i == 0
       actor.skill_set[i]= SKILL_INDEX_WEAPON[actor.equip_set[i]]
     else
       actor.skill_set[i]= SKILL_INDEX_ARMOR[actor.equip_set[i]]
     end
   end
   actor.last_skill_set = actor.skill_set
 end


 def self.equipment_skill_grant(actor)
   for i in 0..4
     for s in actor.skill_set[i]
       actor.learn_skill[s]
     end
   end
 end
 
 
 def self.equipment_skill_removal(actor)
   for i in 0..4
     for s in actor.last_skill_set[i]
       actor.forget_skill[s]
     end
   end
 end
 
 
 def self.update_equip_set(actor)
   # This is the line that the error refers to
   return actor.equip_set[0, 5] = [actor.weapon_id,actor.armor1_id,actor.armor2_id,actor.armor3_id,actor.armor4_id]
 end

 
 def self.update_skills(actor)
   SKRenSGE::update_equip_set(actor)
   if actor.equip_set != actor.last_equip_set
     SKRenSGE::equipment_skill_removal(actor)
     SKRenSGE::skill_index(actor)
     SKRenSGE::equipment_skill_grant(actor)
   end
   actor.last_equip_set = actor.equip_set
 end
end

[/spoiler]


Can anyone explain to me what I am or am not doing to deserve this error?

The error is this line I believe.
return actor.equip_set[0, 5] = [actor.weapon_id,actor.armor1_id,actor.armor2_id,actor.armor3_id,actor.armor4_id]
What you are doing is assigning the array with the values after the equal sign, however you also wrote a return statement. Remove return and see if that works. I'm pretty sure you cannot assign a variable in the same line that you are doing a return. Also, when you call that function in the update_skills function

SKRenSGE::update_equip_set(actor)

You aren't assigning a variable to that. If you expected the update_equip_set function to return a value you would need to store that value somewhere.

So, just change
return actor.equip_set[0, 5] = [actor.weapon_id,actor.armor1_id,actor.armor2_id,actor.armor3_id,actor.armor4_id]
to
actor.equip_set[0, 5] = [actor.weapon_id,actor.armor1_id,actor.armor2_id,actor.armor3_id,actor.armor4_id]