The Parent property of Human is locked, current parent: NULL, new parent Backpack error

plr.CharacterAdded:Connect(function(chr)
chr:AddTag(“Combo1”)
> fstool.Parent = plr.Backpack
raceval.Changed:Connect(function()
local oldpos = chr.HumanoidRootPart.CFrame
local scale = stattable[raceval.Value].Scale
plr.Backpack:ClearAllChildren()
chr.ScaleTo(chr,scale)
chr.ArmorVal.Value = stattable[raceval.Value].ArmorVal
dmgmltplr.Value = stattable[raceval.Value].Damage
chr.HumanoidRootPart.CFrame = oldpos
if game.ReplicatedStorage.Tools.FS:FindFirstChild(stattable[raceval.Value].StarterPack) then
local tool = game.ReplicatedStorage.Tools.FS:FindFirstChild(stattable[raceval.Value].StarterPack):Clone()
tool.Parent = plr.Backpack
end
end)
end)

the error occurs on line 71 (i made it bold)

Humanoids must be parented to some kind of character.
More is explained here: Roblox Humanoids