Ive seem some post but they seem to be incomplete

Hi i use
materia System and Converted for VX by Atoa
and also [VX] ◦ Party Manager/Switcher ◦ By Prexus

both work great when i use it seperatly but when i use both i get this error<<

Script 'Materia system' LINE 722: NoMethodError Occurred
undefined method * for nil:NilClass

here is line 722
#722 sn = [$data_weapons[@weapon_id].paired_materia * 2 + $data_weapons[@weapon_id].single_materia, 8].min unless @weapon_id == 0
#723 @weapon_materia = @weapon_id == 0 ? [] : Array.new(sn, nil)

i've seen a lot of request concerning this problem but never saw even one good answer
we need help!! be our savior

thanks a lot for those who come up with a solution
maybe changing the party script for something identical that dont cause any problem
but changing the materia script seem to be more peaky

If you need any more information let me know
i really need these 2 things working togheter

My friend who never use ruby got the solution
he modified both scripts and it work perfectly on first view
so use it and tell me if something wrong
but it should work
im gona attach both files

dont give credit we dont give a f...
but Milhouse did it