Visual Studio: How to activate compile errors?

sorry, this is not a very nice question for here, but I'm very stressed right now and i have to finish sth. now, so...

I accidentially deactivated compile errors in Visual Basic and I cannot find the option to reactivate. Google doesn't help, and manuals, too.

Please help :(

Thx very much! fLo

EDIT:

It's about the errors when, for example, I run the following code:

    Dim a As Integer
    a = 9999999999999999开发者_开发知识库999

Then, usually, the program gets stopped and a given error message shows (what type of exception, which row etc.).

You're probably looking for View, Error List.