Cross-referencing section in different file

[rdagold]

I want to cross-reference a section which is in a different file, for example refer in chapter 4 the section 2 of chapter 3.

When I try to do this, I get the following error:

LaTeX Warning: Reference `sec:mysection' on page 15 undefined on input line 5

What should I do or change in order for this to work?

Thanks for the great template.

[suchow]

Did you run the LaTeX command more than once? (You should.)

And are you sure there isn't a typo in the sec:mysection label?