Errors from the basics

I’m new to coding and gtk and I am trying to code something with gnome-builder and vala…
The problem is that everytime I try to run my code it returns things like this:

The name `Gtk' does not exist in the context of `main'

and similars…
Maybe I’m wrong, but I was thinking that creating a new project using Builder, settings like folder projects, libraries reference and so on was already setted up. What /where I have to adjust this settings?

Thanks in advance.

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