You can write your topic however you want, but you need to answer these questions:
What do you want to achieve?
I wanted to tween a part and change his color and material using TweenService.
What is the issue?
There is a error that`s saying:
" TweenService:Create property named ‘Material’ cannot be tweened due to type mismatch (property is a ‘int’, but given type is ‘token’)"
What solutions have you tried so far?
I tried to find a solution here, but some of developers, which also had this problem, had a different error(like they tried to tween Position with CFrame, not Vector3 and etc).
Since Enums are not actually numerals(and it would actually be awkward if you tried to tween through the fixed list of materials), you cannot really use it for tweening. You might need a different way of switching the material, whether it is midway through or right at the end of the tween.