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Thanks, much appreciated.

Thanks again Stefan,

I had also mistakenly been trying to compile individual chapters.

I see I need to leave myself some notes.

Hello Stefan,

Thanks for your reply. I only added that document class line in recently because I received this message without it:

Because of the file size I decided to work with individual documents rather than the book class. I've returned to the book class after a year off and found code that previously worked, no longer does. The Texmaker version is 5.1.4 (I'll download the newer version but thought I'd see if the problem ...

Many thanks Rainer and Stefan,

This has identified the problem and also provided a fix, for this problem and likely others I'll come across.

Bob

Hello Rainer,

Thanks for your reply.

I'm not sure I completely understood your test. I typed your text, but had to copy from MS WORD the á because I didn't know how to directly type this into Texmaker. If this is ok, Lázaro displays correctly.

I have attached a zio file that contains the tex file ...

Thanks Stefan.

I added in the packages, 1 by 1

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}

the error remained, in both Texmaker and Texlive.

I then tried compiling with LuaLaTeX and XeLaTeX. The file compiled without error but the characters don't appear in the ...

Hopefully with photos, an executable example.

\documentclass{article}
\usepackage{xcolor}
\usepackage{titlesec}
\usepackage[a4paper, total={7in, 10in}]{geometry}
\usepackage{graphicx}
\usepackage[english] {babel}
\usepackage{blindtext}
\usepackage[section]{placeins}
\usepackage{subcaption ...

Hello Stefan,

Removing this code below and the file runs. I tried running the file without the photos and with just the text, and I still get the error, so it is not because I included this in the caption.

Thanks again.

Bob


\begin{figure}[htb]
\centering
\begin{subfigure}{0.45\textwidth ...

When the file is saved, besides the pdf I can see an AUX, txt, OUT and a GZ file and a (la)TeX document file. A search of my harddrive didn't reveal any /.lof files associated with LaTex programs.