Character is not a valid member of Model what should I do?

llocal function equipPet(player,pet)

local character =  player.Character--problem is here

if pet ~= nil and character ~= nil then
	
	if character:FindFirstChild(player.Name.."'s pet") then character[player.Name.."'s pet"]:Destroy() end


	pet.Name = player.Name.."'s pet"		

	pet:SetPrimaryPartCFrame(character.HumanoidRootPart.CFrame)

	local modelSize = pet.PrimaryPart.CFrame
	
	local attachmentCharacter = Instance.new("Attachment")
	attachmentCharacter.Visible = false
	attachmentCharacter.Parent = character.HumanoiRootPart
	attachmentCharacter.Position = Vector3.new(1,1,0) + modelSize

	local attachmentPet = Instance.new("Attachment")
	attachmentPet.Visible = false
	attachmentPet.Parent = pet
	
	local alignPosition = Instance.new("AlignPosition")
	alignPosition.MaxForce = 25000
	alignPosition.Attachment0 = attachmentPet
	alignPosition.Attachment1 = attachmentCharacter
	alignPosition.Responsiveness = 25
	alignPosition.Parent = pet

	pet.Parent = character


end

end

It says that problem is Character is not a valid member of a model

hello there! I’m here to talk about your problem. First of all most of the time the character doesn’t load yet. So i suggest you try this on line 1

local character = player.Character or player.CharacterAdded:Wait()

so if the character hasn’t load yet, it will wait for it to load. Hope this works and helps!

That means that the player you gave is actually model, not a player. Find where a model was accidentally passed, then change it to a player (if the model is related to a player) or prevent equipPet from being used in that case (if the model is not related to a player).

You could quickly check what the model you accidentally passed by printing the passed player. If it's the player's character (this is a guess because not enough of the script was given), you give the result of GetPlayerFromCharacter to equipPet instead of the model directly. You could show the part of the script that uses equipPet if it's not a character and you want to let people find the mistake.