I have no idea where is the mistake! I show here the packages I'm using:
Code: Select all
\documentclass[a4paper,12pt]{article}
\usepackage{anysize}
\usepackage{fancyhdr}
\usepackage{setspace}
\usepackage{longtable}
\usepackage{lscape}
\usepackage{color}
\usepackage{rotating}
\usepackage{textcomp}
\usepackage[spanish]{minitoc}
\usepackage{epsf}
\usepackage[absolute]{textpos}
\usepackage[spanish]{babel}
\usepackage [applemac] {inputenc}
\usepackage{latexsym}
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{Config/bpchem}
\usepackage[version=3]{mhchem}
\usepackage {amsfonts}
\usepackage{xkeyval}
\usepackage{enumerate}
\marginsize{3cm}{2cm}{2.5cm}{2.5cm}
\sloppy
\frenchspacing
\pagestyle{headings}
\pagenumbering{arabic}
\setcounter{page}{3}