TweenService:Create failed because Instance is null

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#1

Hi there!

I’m attempting to make a movement system. I’ve added in almost every feature so far and everything works well. The only major feature left is crouching, and to do this I want to change the size of one of the parts. Here’s what I have for it (irrelevant stuff cut out).

local Player = game:GetService("Players").LocalPlayer
local Character = Player.CharacterAdded or Player.CharacterAdded:wait()
local Humanoid = Character:WaitForChild("Humanoid")
local HumanoidRootPart = Character:WaitForChild("Humanoid")


Player.CharacterAdded:Connect(function(NewCharacter)

	Character = NewCharacter

	HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")
	Humanoid = Character:WaitForChild("Humanoid")

	GroundCheck = Character:WaitForChild("GroundCheck")
	PlayerHitbox = Character:WaitForChild("PlayerHitbox")

	GroundCheck.Position = HumanoidRootPart.Position - Vector3.new(0, 4.2, 0)
	PlayerHitbox.Position = HumanoidRootPart.Position - Vector3.new(0, 0.9, 0)

end)

local CrouchEnter = TweenInfo.new(
	0.2, 
	Enum.EasingStyle.Linear, 
	Enum.EasingDirection.In, 
	0, 
	false,
	0
)

local RootPartCrouchEnterGoal = {
	Size = Vector3.new(2.5, 1.8, 1)
}

local RootPartCrouchEnter = TweenService:Create(HumanoidRootPart, CrouchEnter, RootPartCrouchEnterGoal)

The last time I had this I fixed it to defining the HumanoidRootPart how I did it here. For those wondering, this is in a LocalScript, using a StarterCharacter with the primary part set to be the HumanoidRootPart. For everything else where I have needed to define the character, humanoid or the rootpart, it’s worked. I have no clue why this doesn’t, as to me this looks right.

Any help is appreciated.

#2

This is the problem. You addressed the HumanoidRootPart as just “Humanoid”. Should be

local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")
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#3

Why are you setting this to the Humanoid instance? It should be the root part instead.

I also don’t understand what are you making the character added event to change those variables where you could just use the :WaitForChild() method to get the instance you need.

#4

Both of those is me being very dumb and not checking my code before posting. I was trying different solutions (that character added event is what I used before), and copy pasted some different stuff in which has messed up a bunch of stuff.

Interestingly now that I’ve fixed that, the error has changed to “WaitForChild is not a valid member of RBXScriptSignal”. No clue what this is, I’ve never seen this before.

fixed code, just in case:

local Player = game:GetService("Players").LocalPlayer
local Character = Player.CharacterAdded or Player.CharacterAdded:wait()
local Humanoid = Character:WaitForChild("Humanoid")
local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart")

local CrouchEnter = TweenInfo.new(
	0.2, 
	Enum.EasingStyle.Linear, 
	Enum.EasingDirection.In, 
	0, 
	false,
	0
)

local RootPartCrouchEnterGoal = {
	Size = Vector3.new(2.5, 1.8, 1)
}

local RootPartCrouchEnter = TweenService:Create(HumanoidRootPart, CrouchEnter, RootPartCrouchEnterGoal)
#5

you’re setting the Character variable as the Player.CharacterAdded event

replace the line with this:
local Character = Player.Character or Player.CharacterAdded:Wait()

(p.s. don’t use :wait() in new work, as its deprecated)

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