why do I get an Unable to cast to Dictionary error?

I keep getting an error "Unable to cast to Dictionary" even though there isn't a dictionary/table. My tween only contains 1 number that aren't in a dictionary.

local Number1 = 0

Number1 += 1
local Tween = game:GetService("TweenService")
local Inf =TweenInfo.new(0.5,Enum.EasingStyle.Linear,Enum.EasingDirection.InOut,1,false,0.1)
Tween:Create(Number1 , Inf, Number1 - 1):Play()

Why do I get this error?

It says it cannot cast to dictionary because the Create method expects a dictionary as the third parameter. You cannot tween number values, you must tween an instance. The third parameter would hold the new properties of the instance in a dictionary, even if it is one value. If you want to tween a number, use a floatValue and adjust the value

https://developer.roblox.com/en-us/api-reference/function/TweenService/Create

-- Script example for tweening a float value
local Tween = game:GetService("Tween");

local num = Instance.new("FloatValue");
num.Value = 1;
num.Parent = game.Workspace;

local info =TweenInfo.new(
	0.5,
	Enum.EasingStyle.Linear,
	Enum.EasingDirection.InOut,
	1,
	false,
	0.1
);

local goal = {
	Value=num.Value - 1;
};

Tween:Create(num, info, goal):Play();