"Attempt to index function with 'Number' " Error... What exactly am I doing wrong?

function snek(obj)
    if obj.Parent:FindFirstChildWhichIsA("Humanoid") then
        for _, v in ipairs(model:GetChildren()) do
            if v:IsA("BasePart") then
                v.CanTouch = false
            end
        end
        while snek.Number.Value < #PATH do -- This line is where I'm getting an error.
            block()
            for t = 1, SPEED do
                move(snek, SIZE/SPEED, PATH[snek.Number.Value])
                move(tail, SIZE/SPEED, PATH[tail.Number.Value])
                wait()
            end
            snek.Number.Value += 1
            tail.Number.Value += 1
            for _, v in ipairs(model:GetChildren()) do
                if v.Name == "Body" and v.Number.Value == tail.Number.Value then
                    v:Destroy()
                end
            end
        end
    end
end