VBA assigning new object to variable?

Question

I'm trying create new object from a module class in VBA, and I have a small diffcult. Two line of assigning code, look like the same, but result is different.

I got a error message:

After that, I switch to use (1) instead of (2), error was fixed.

But I dont understand; Why do they have this difference?

Answer 1

Dim declares a variable, Set instantiates it.

So, it's a good practice to always have Dim before Set.