"Material does not have a _MainTex textzure property" Error while my shader has MainTex_

So I tried to make the pixelating shader using this tutorial:

But when my texture just becomes full black presumably because of this error:

While my shader graph vlearly has a property like that:

I use Unity 2020.3.12f1 with URP 10.5.1

 

You may have to checkmark the

Exposed

option so that it becomes a serialized material property.

Also, if you haven't, give Unity a restart.