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documentclassを 'scrbook'に変更したいと思います。最小ブックダウン例のindex.Rmdファイルでは、documentclass: bookをdocumentclass: scrbookに変更しましたが、これは機能しませんでした。私は、次のエラーメッセージが表示されました：bookdownのdocumentclass 'scrbook'に変更することはできますか？
Latexmk: applying rule 'pdflatex'...
Latexmk: This is Latexmk, John Collins, 19 Jan. 2017, version: 4.52c.
Rule 'pdflatex': File changes, etc:
Non-existent destination files:
'test-bookdown.pdf'
------------
Run number 1 of rule 'pdflatex'
------------
------------
Running '/Library/TeX/texbin/xelatex -halt-on-error -interaction=batchmode -recorder "test-bookdown.tex"'
------------
This is XeTeX, Version 3.14159265-2.6-0.99998 (TeX Live 2017) (preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
=== TeX engine is 'XeTeX'
Latexmk: Errors, so I did not complete making targets
Latexmk: Log file says no output from latex
Latexmk: For rule 'pdflatex', no output was made
Collected error summary (may duplicate other messages):
pdflatex: Command for 'pdflatex' gave return code 1
Refer to 'test-bookdown.log' for details
Latexmk: Use the -f option to force complete processing,
unless error was exceeding maximum runs of latex/pdflatex.
! LaTeX Error: Command \subtitle already defined.
Or name \end... illegal, see p.192 of the manual.
Error: Failed to compile test-bookdown.tex. See test-bookdown.log for more info.
Please delete test-bookdown.Rmd after you finish debugging the error.
Execution halted
Exited with status 1.
はpandoc（記事、レポート、書籍、回顧録）によってサポートされているもの以外の他の文書クラスに変更する方法はありますか？
Build Bookタブで提供されているコマンドrmarkdown::render_site(output_format = 'bookdown::pdf_book', encoding = 'UTF-8')をコンパイルに使用しました。
R version 3.4.2 (2017-09-28)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Sierra 10.12.6
Matrix products: default
BLAS: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.4/Resources/lib/libRlapack.dylib
locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.4.2 backports_1.1.1 bookdown_0.5.4 magrittr_1.5 rprojroot_1.2
[6] htmltools_0.3.6 tools_3.4.2 yaml_2.1.14 Rcpp_0.12.13 stringi_1.1.5
[11] rmarkdown_1.6.0.9004 knitr_1.17 stringr_1.2.0 digest_0.6.12 evaluate_0.10.1
> rmarkdown::pandoc_version()
[1] ‘1.19.2.1’
> system('pdflatex --version')
pdfTeX 3.14159265-2.6-1.40.18 (TeX Live 2017)
kpathsea version 6.2.3
Copyright 2017 Han The Thanh (pdfTeX) et al.
There is NO warranty. Redistribution of this software is
covered by the terms of both the pdfTeX copyright and
the Lesser GNU General Public License.
For more information about these matters, see the file
named COPYING and the pdfTeX source.
Primary author of pdfTeX: Han The Thanh (pdfTeX) et al.
Compiled with libpng 1.6.29; using libpng 1.6.29
Compiled with zlib 1.2.11; using zlib 1.2.11
Compiled with xpdf version 3.04