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I'm working on Ubuntu (16.04 LTS) with TexStudio.

Following the quickstart tutorial on forest (for linguists), I tried the easiest tree possible:

\documentclass[11pt]{article}
\usepackage[linguistics]{forest}

\title{Tree}
\author{Me}

\begin{document}
\maketitle

\begin{forest}
    [CP[C][IP[I][VP[V][NP]]]]
\end{forest}

\end{document}

I get a bunch of error messages, beginning with:

Illegal parameter number in definition of \pgfk@/handlers/.wrap 6 pgfmath args/.@@body. }

As far as I understood from forums online, I have to update the "pgf" package. But I checked for that (on synaptic package manager), and it seems I already have the latest version (2.10-1).

Does one have any clue how to solve my problem ? (and sorry if this is a terrible beginner question!)

Meuhlodi
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  • Do you have texlive-pictures installed? – Johann Bauer Mar 19 '17 at 12:28
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    The latest pgf version is 3.0.1a 2015-08-29, see http://ctan.org/pkg/pgf. The error you're getting is due to an old bug in pgf, so I recommend an update. – Sašo Živanović Mar 19 '17 at 12:46
  • If you are getting both PGF and Forest from your distro, you should report this as a bug: they should not package a later version of Forest without the version of PGF it requires. Consider using upstream TeX Live. – cfr Mar 19 '17 at 14:44
  • @JohannBauer: yes, I have texlive-pictures – Meuhlodi Mar 19 '17 at 16:32
  • @cfr: I will look for upstream Tex Live, thanks for the indication! – Meuhlodi Mar 19 '17 at 16:36
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    I'm voting to close this question as off-topic because the issue was due to incompatible versions of PGF and forest – egreg Apr 28 '17 at 12:12

1 Answers1

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Ok, thanks for your help, guys! I had a hard time finding out how to do it, but at the end I found a very good explaination on how to install (updated) Tex Live on Ubuntu. The problem came from the OS (Ubuntu) and its default Tex Live.

Easy trees (see first message) are working fine now.

Meuhlodi
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