Obscure error message from asciidoc

[Walckiers]

I'm trying to use asciidoc-packt
I'd be grateful if someone could interpret the following error message
asciidoc: FAILED: asciidoc_manual.txt: line 8: illegal [miscellaneous] subsverbatim: specialcharacters,callouts,replacements3: replacements3

That was in response to this command
asciidoc -b packt --theme packt asciidoc_manual.txt

I'm running on Ubuntu 12.04

In case its relevant, here is what I did to install packt-theme-0.1.0.zip
sudo asciidoc --theme install packt-theme-0.1.0.zip /etc/asciidoc/themes/packt

And the second zip (packt-backend-0.1.0.zip)
sudo asciidoc --backend install packt-backend-0.1.0.zip /etc/asciidoc/backends/packt

[gregturn]

Regretfully, I'm moving my work to asciidoctor, so I probably won't be making much more in edits to the asciidoc version of things.