HumanoidRootPart is not a valid member of Humanoid?

I'm trying to make a fireball generator to make it look like bowser did it but it doesn't work :/

Here's the code:

       local function createFirebolt()
                                    local firebolt = Instance.new("Part")
                  firebolt.Position = bowser.HumanoidRootPart.Position + Vector3.new(-2,0,0) --Error
             firebolt.Shape = "Ball"
                     firebolt.Size = Vector3.new(1,1,1)
                        firebolt.BrickColor = BrickColor.Red()
                               firebolt.CanCollide = false
                                   firebolt.Parent = workspace