Can't generate epub: undefined method `to_ios'

[yfain]

I have a pretty simple adoc file and asciidoctor 1.5.2. Tried to generate epub and got this:

$ asciidoctor-epub3 joiningCTOschool.adoc
undefined method `to_ios' for #Asciidoctor::Epub3::Packager:0x007faf990a79e0
Use --trace for backtrace

Running with --trace produced this:

Yakov:ctoschool yfain11$ asciidoctor-epub3 --trace joiningCTOschool.adoc
/Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:303:in postprocess_xhtml': undefined methodto_ios' for #Asciidoctor::Epub3::Packager:0x007f99db82d288 (NoMethodError)
from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:250:in block (3 levels) in add_content' from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:248:ineach'
from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:248:in each_with_index' from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:248:inblock (2 levels) in add_content'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/resource_builder.rb:40:in instance_eval' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/resource_builder.rb:40:inblock in ordered'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/package.rb:166:in ordered' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/book.rb:205:inordered'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/resource_builder.rb:39:in ordered' from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:245:inblock in add_content'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/resource_builder.rb:33:in instance_eval' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/resource_builder.rb:33:ininitialize'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/builder.rb:292:in new' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/builder.rb:292:inresources'
from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:240:in add_content' from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:422:inblock in package'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/builder.rb:185:in instance_eval' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/gepub-0.6.9.2/lib/gepub/builder.rb:185:ininitialize'
from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:340:in new' from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/packager.rb:340:inpackage'
from /Users/yfain11/asciidoctor-epub3/lib/asciidoctor-epub3/converter.rb:37:in write' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/asciidoctor-1.5.2/lib/asciidoctor/document.rb:1051:inwrite'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/asciidoctor-1.5.2/lib/asciidoctor.rb:1504:in convert' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/asciidoctor-1.5.2/lib/asciidoctor/cli/invoker.rb:94:inblock in invoke!'
from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/asciidoctor-1.5.2/lib/asciidoctor/cli/invoker.rb:86:in each' from /Users/yfain11/.rbenv/versions/1.9.3-p392/lib/ruby/gems/1.9.1/gems/asciidoctor-1.5.2/lib/asciidoctor/cli/invoker.rb:86:ininvoke!'
from /Users/yfain11/asciidoctor-epub3/bin/asciidoctor-epub3:13:in `

'

[mojavelinux]

If I remember correctly, Asciidoctor EPUB3 is fussy about having just the right structure for the document. We obviously want to fix this. Until then, refer to the following example and be sure to follow the same structure, working backwards from the example to your doc.

https://github.com/asciidoctor/asciidoctor-epub3/blob/master/data/samples/sample-book.adoc

[mojavelinux]

To provide some context...Asciidoctor EPUB3 was flexible to handle any AsciiDoc document at one point, but somewhere along the line I broke it. Tests would obviously be a huge benefit here :)

[mojavelinux]

I have detailed the required structure in the README. See https://github.com/asciidoctor/asciidoctor-epub3#structuring-your-manuscript

[mojavelinux]

I'm going to close this as a duplicate of #47. It's the same issue.