Error: ! Package utf8x Error: MalformedUTF-8sequence. using \include{} function

Question

I'm writing my thesis in spanish on latex and I'm using the \include{} function to bring other .tex files to my master.tex (main file).

My encoding looks something like this:

\documentclass[11pt,a4paper,twoside]{report}

\usepackage[spanish]{babel}
\addto\shorthandsspanish{\spanishdeactivate{~<>}}

\usepackage[T1]{fontenc}
\usepackage[utf8x]{inputenc}
.
.
\begin{document}
some text here...
\tableofcontents
\include{chapter1}
.
.
\end{document}

The thing is that the master.tex file writes perfectly spanish accents. But, when I try to include a chapter, it comes out with this error (! Package utf8x Error: MalformedUTF-8sequence.) And I checked it out and, for example it comes when I do:

This is chapter1.tex:
\chapter{Justificación del tema}
.
.
(in master.tex file: \include{chapter1}

It comes with the error when I do the ó, but If I write "Justificacion" (with no " ´ " on top of the "o", everythings fine.

Does anybody know how can I get this fixed? Do I have to put something on top of the chapter1.tex file?

To know: - I'm using TexMAKER on Windows 7.

I'd be very grateful if someone could help me! Thank you and greetings from Chile!

Answer 1

If you are having the same problem I had, you just have to put the following code into the .tex files that are going to be included in your master file:

%!TEX root = master.tex

Say you are writing an introduction, you create the introduction.tex file and you include it in master.tex with \include{introduction.tex}. The above code should be at the top of introduction.tex.

(The master.tex file is your main document.)