I'm having a problem with my first Lua script.

[SoraTheDev]

Hello! I'm currently having a problem with my first Lua script. I am modifying the "Chair Throwing Gun" script of the GMOD Lua Wiki, but something is giving me errors. I get this error:

[ERROR] lua/autorun/weapon_melonlauncher.lua:4: attempt to index global 'SWEP' (a nil value)
  1. unknown - lua/autorun/weapon_melonlauncher.lua:4

Here's my code:

print ("MelonLauncher by SoraTheDev has launched sucessfully!")
AddCSLuaFile("cl_init.lua")
AddCSLuaFile("weapon_melonlauncher.lua")
SWEP.PrintName = "Melon Launcher"
SWEP.Author = "SoraTheDev"
SWEP.Instructions = "Press the left mouse button to fire a melon and the right mouse button to fire a sawblade!"
SWEP.Contact = "x"
---------------------------
SWEP.Spawnable = true
SWEP.AdminOnly = false
---------------------------
SWEP.Primary.ClipSize = -1
SWEP.Primary.DefaultClip = -1
SWEP.Primary.Automatic = false
SWEP.Primary.Ammo = "none"
---------------------------
SWEP.Secondary.ClipSize = -1
SWEP.Secondary.DefaultClip = -1
SWEP.Secondary.Automatic = false
SWEP.Secondary.Ammo = "none"
---------------------------
SWEP.Weight = 5
SWEP.AutoSwitchTo = false
SWEP.AutoSwitchFrom	= false
SWEP.Slot = 1
SWEP.SlotPos = 2
SWEP.DrawAmmo = false
SWEP.DrawCrosshair = false
---------------------------
SWEP.ViewModel = "models/weapons/v_pistol.mdl"
SWEP.WorldModel = "models/weapons/w_pistol.mdl"
---------------------------
local primarySound = Sound("garrysmod/addons/melonlauncher/lua/sounds/doot.wav")
local secondarySound = Sound("garrysmod/addons/melonlauncher/lua/sounds/pootis.mp3")
---------------------------
function SWEP:PrimaryAttack()
    self.Weapon:SetNextPrimaryFire( CurTime() + 0.5 )
    self:melon("models/props_junk/watermelon01.mdl")
end
function SWEP:SecondaryAttack()
    self:blade("models/props_forest/sawblade_moving.mdl")
end
function SWEP:melon(model_file)
    self:EmitSound(primarySound)
    if (CLIENT) then return end
    local ent = ents.Create("prop_physics")
    if (!IsValid (ent)) then return end
    ent:SetModel (model_file)
    ent:SetPos( self.Owner:EyePos() + ( self.Owner:GetAimVector() * 16 ) )
	ent:SetAngles( self.Owner:EyeAngles() )
	ent:Spawn()
    local phys = ent:GetPhysicsObject()
    if (!IsValid (phys)) then ent:Remove() return end
	local velocity = self.Owner:GetAimVector()
	velocity = velocity * 200
	velocity = velocity + (VectorRand() * 10)
	phys:ApplyForceCenter(velocity)
    cleanup.Add( self.Owner, "props", ent)
	undo.Create("Thrown_Melon")
	undo.AddEntity(ent)
	undo.SetPlayer(self.Owner)
	undo.Finish()
end
function SWEP:blade(model_file)
    self:EmitSound(secondarySound)
    if (CLIENT) then return end
    local ent = ents.Create("prop_physics")
    if (!IsValid (ent)) then return end
    ent:SetModel (model_file)
    ent:SetPos( self.Owner:EyePos() + ( self.Owner:GetAimVector() * 16 ) )
	ent:SetAngles( self.Owner:EyeAngles() )
	ent:Spawn()
    local phys = ent:GetPhysicsObject()
    if (!IsValid (phys)) then ent:Remove() return end
	local velocity = self.Owner:GetAimVector()
	velocity = velocity * 200
	velocity = velocity + (VectorRand() * 10)
	phys:ApplyForceCenter(velocity)
    cleanup.Add( self.Owner, "props", ent)
	undo.Create("Thrown_Sawblade")
	undo.AddEntity(ent)
	undo.SetPlayer(self.Owner)
	undo.Finish()
end

How can I solve this? Thank you!

[zoox]

I think you have to put weapons in lua/weapons/

[SoraTheDev]

[QUOTE=zoox;52067027]I think you have to put weapons in lua/weapons/[/QUOTE]

I did it, but it doesn't work. I mean, I first put the script on lua/weapons/ and then I put it on garrysmod/lua/autorun.

[zoox]

Do you get a different error message when you put in in lua/weapons/ ?

[SoraTheDev]

[QUOTE=zoox;52067047]Do you get a different error message when you put in in lua/weapons/ ?[/QUOTE]

As I said, I first put the script on lua/weapons/, and then I tried to use lua_openscript but it wouldn't work. So, I put it on garrysmod/lua/autorun.

[zoox]

If I put your code in lua/weapons/ it seems to work fine for me

[c👌de_g🎷]

You don't use lua_openscript; lua/weapons is loaded automatically in the SWEP environment -- it will not work in lua/autorun.

[SoraTheDev]

[QUOTE=zoox;52067065]If I put your code in lua/weapons/ it seems to work fine for me[/QUOTE]

It worked! Thank you very much! There's only one more problem. The sound I have set does not play. How can I fix this?

[c👌de_g🎷]

Emit the sound from the player, not from the weapon.

[Wavie]

I'd recommend you not even starting with this. Creating a decent weapon script is moderately difficult.

Unless you're just doing it for shits and giggles.