How display compile errors?

This is a really dumb question by a first-time user.

When I compile my project, I get a few compilation error (or “problems”) and some warnings. I can display the warnings by clicking the triangle icon on the lower left with the exclamation point in it and get a nice display with text and line numbers.

But how do I display the errors? There is a circle icon, also on the lower left, containing an X, that looks hopeful. But when I click it all I get is the warnings again.

Thanks for any help you can give me.

In the problems window click on the error message. After that the editor automatically shows the corresponding file and the line with the problem. Additionally the numbers inside the brackets at the end of the message tell you line and column of the problem.