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Thanks!!

Thorsten, the error still appears even if I don't write the accent in the label... By the way, do you mean there is no way to write accents in labels?

Hello,

I have been trying to compile a file but there seems to be an error. Here's my MWE:

\documentclass[twoside,a4paper,11pt]{article}
\usepackage[latin1]{inputenc}
\usepackage[catalan]{babel}
\usepackage{amsmath,amsthm}
\usepackage{amsfonts}
\title{Funcions convexes. Desigualtat de Jensen ...