Hyperref – Fix LaTeX Error: Glyph Not Defined in PD1 Encoding

hyperref

I am writing lecture notes for ordinary differential equations in greek using the book class in Overleaf. Everything was fine (no errors, no warnings) till I included a png picture. Since I included the picture (named 1.png) every letter in chapter's title is giving a warning. I removed a lot of things from the code so that it doesn't get too long.

\documentclass[a4paper,10pt]{book}
\usepackage[utf8]{inputenc}
 \usepackage[english,greek]{babel}
\usepackage{amsmath}
\usepackage{amsthm}
 \usepackage{graphicx}
\usepackage{amsfonts}
 \usepackage[colorlinks]{hyperref}

\title{Συνήθεις Διαφορικές Εξισώσεις}
 \author{}
 \theoremstyle{definition}
\newtheorem{examp}{Παράδειγμα}[section]
 \theoremstyle{definition}
\newtheorem{defin}[examp]{Ορισμός}
\theoremstyle{definition}
\newtheorem{notice}[examp]{Παρατήρηση}
 \begin{document}
\maketitle
\newpage
\tableofcontents
  
\chapter{Γραμμικές ή ντετερμινιστικές εξισώσεις }






\includegraphics[width=5.5cm, height=4cm]{1}

The warning I get for the first letterPackage hyperref Warning: Glyph not defined in PD1 encoding, removing\textGamma' on input line 23.`

Best Answer

It should run without error with a current hyperref but otherwise use

\usepackage[unicode]{hyperref}

so bookmarks can use Unicode rather than the original PDF string encoding (which does not allow Greek).

Related Question