Issue with Raycast, "attempt to index nil with 'Instance'"

[VeilStrife (VeilStrifeDudeMan)]

Hello Fellow Developers!

Recently, I was following a tutorial on how to make a RayCast gun Using FastCast module

I ran into a problem while following the tutorial, There was a error where it said “Attemp to index nil with 'Instance”

Here is my code:

local fireEvent = tool.FireEvent
local FastCast = require(tool.FastCastRedux)
local firePoint = tool.Handle.FirePoint
local speed = tool:GetAttribute("Speed")
local damage = tool:GetAttribute("Damage")

local bulletsFolder = Instance.new("Folder", workspace) or workspace:FindFirstChild("BulletFolder")
bulletsFolder.Name = "BulletFolder"

local bulletTemplate = Instance.new("Part")
bulletTemplate.Anchored = true
bulletTemplate.CanCollide = false
bulletTemplate.Shape = "Block"
bulletTemplate.Size = Vector3.new(0.2, 0.2, 1)
bulletTemplate.Material = Enum.Material.Neon
bulletTemplate.BrickColor = BrickColor.new("190")
	
--FastCast.VisualizeCasts = false

local caster = FastCast.new()

local castParams = RaycastParams.new()
castParams.FilterType = Enum.RaycastFilterType.Exclude
castParams.IgnoreWater = false

local castBehavior = FastCast.newBehavior()
castBehavior.RaycastParams = castParams
castBehavior.Acceleration = Vector3.new(0, -workspace.Gravity, 5)
castBehavior.AutoIgnoreContainer = false
castBehavior.CosmeticBulletContainer = bulletsFolder
castBehavior.CosmeticBulletTemplate = bulletTemplate

local function onEquipped()
	castParams.FilterDescendantsInstances = {tool.Parent, bulletsFolder}
end

local function onLenghtChanged(cast, lastPoint, direction, length, velocity, bullet)
	if bullet then
		local bulletLength = bullet.Size.Z/2
		local offset = CFrame.new(0, 0, -(length - bulletLength))
		bullet.CFrame = CFrame.lookAt(lastPoint, lastPoint + direction):ToWorldSpace(offset)
	end
end

local function onRayHit(cast, result, velocity, bullet)
	local hit = result.Instance.new -- This is where the main error is happening
	
	local character = hit:FindFirstAncestorWhichIsA("Model")
	if character and character:FindFirstChild("Humanoid") then
		character.Humanoid:TakeDamage(damage)
	end
end

local function fire(player, mousePosition)
	local origin = firePoint.WorldPosition
	local direction = (mousePosition - origin).Unit

	caster:Fire(origin,direction, speed, castBehavior)
end

game:GetService("Debris"):AddItem(bullet, 10) -- Secondary Problem on "bullet"

fireEvent.OnServerEvent:Connect(fire)

tool.Equipped:Connect(onEquipped)

caster.LengthChanged:Connect(onLenghtChanged)
caster.RayHit:Connect(onRayHit()) 

I also have a secondary problem with the bullet not being able to be removed, saying
“Unknown global ‘bullet’”

helping me with these would be very much appreciated!

• VeilStrife

[LimitedEffect]

1. Bullet Error: there was never a “bullet” variable created in the scope that you’re using it. You might be trying to use “bulletTemplate” which is the part you created in the 3rd block of code.

2. Instance Error: In the very last line where it says:
   caster.RayHit:Connect(onRayHit())

you incorrectly connected the function “onRayHit”

The last line should look like this:
caster.RayHit:Connect(onRayHit)

When connecting a function to an event, dont use the parenthesis. Hope this helped!

[VeilStrife (VeilStrifeDudeMan)]

Thanks for the help! Sorry i couldn’t respond to you for the past 3 days as i was busy.