Can't get theme to work with asciidoctor-pdf

$ asciidoctor-pdf -v
Asciidoctor PDF 1.5.0.alpha.17.dev using Asciidoctor 2.0.10 [https://asciidoctor.org]
Runtime Environment (ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-linux-gnu]) (lc:UTF-8 fs:UTF-8 in:UTF-8 ex:UTF-8)

I have all my files in the same dir and run this to build:

asciidoctor-pdf -o book.pdf -a pdf-themesdir=. -a pdf-theme=pdf-theme.yml -a compress book.adoc

No error output is produced (in fact no output except for book.pdf).

But when I look at book.pdf it is A4 size and doesn't use the specified fonts or the specified page size or margins. Below is pdf-theme.yml. What am I doing wrong?

extends: default
page:
    margin: [1in, 1in, 1in, 1in]
    size: [9in,7in]
base:
    font-family: DejaVuSerif
heading: # limited to WINASCII
    font-family: Helvetica
menu: # limited to WINASCII
    font-family: Helvetica
title-page: # limited to WINASCII
    font-family: Helvetica
blockquote: # limited to WINASCII
    font-family: Helvetica
sidebar: # limited to WINASCII
    font-family: Helvetica
sidebar-title: # limited to WINASCII
    font-family: Helvetica
abstract: # limited to WINASCII
    font-family: Helvetica
ulist: # limited to WINASCII
    font-family: Helvetica
table: # limited to WINASCII
    font-family: Helvetica
toc: # limited to WINASCII
    font-family: Helvetica
header: # limited to WINASCII
    font-family: Helvetica
footer: # limited to WINASCII
    font-family: Helvetica
code:
    font-family: DejaVuSansMono
literal:
    font-family: DejaVuSansMono
font:
    catalog:
        DejaVuSans:
            normal: DejaVuSans.ttf
            italic: DejaVuSans-Oblique.ttf
            bold: DejaVuSans-Bold.ttf
            bold_italic: DejaVuSans-BoldOblique.ttf
        DejaVuSansFallback:
            normal: DejaVuSans.ttf
            italic: DejaVuSans-Oblique.ttf
            bold: DejaVuSans-Bold.ttf
            bold_italic: DejaVuSans-BoldOblique.ttf
        DejaVuSerif:
            normal: DejaVuSerif.ttf
            italic: DejaVuSerif-Italic.ttf
            bold: DejaVuSerif-Bold.ttf
            bold_italic: DejaVuSerif-BoldItalic.ttf
        DejaVuSansMono:
            normal: DejaVuSansMono.ttf
            italic: DejaVuSansMono-Oblique.ttf
            bold: DejaVuSansMono-Bold.ttf
            bold_italic: DejaVuSansMono-BoldOblique.ttf
    fallbacks:
        - DejaVuSansFallback

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NAML

I used the asciidoctor and asciidoctor-pdf packages that come with Ubuntu 20.04 LTS.
Anyway, I've now removed those packages and installed using gem and it all works great now.
Thanks!

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NAML