Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Error: processing vignette 'brms_overview.ltx' failed with diagnostics:
Running 'texi2dvi' on 'brms_overview.ltx' failed.
LaTeX errors:
! Undefined control sequence.
\UseRawInputEncoding ...tencodingname \@undefined 
                                                  \let \DeclareFontEncoding@...
l.59 \begin{document}
                     
! Missing \endcsname inserted.
<to be read again> 
                   \protect 
l.59 \begin{document}
                     
! Missing \endcsname inserted.
<to be read again> 
                   \cdp@elt 
l.59 \begin{document}
                     
! Missing \endcsname inserted.
<to be read again> 
                   \cdp@elt 
l.59 \begin{document}
                     
! Extra \else.
\@changed@cmd ... #1\expandafter \endcsname \else 
                                                  \noexpand #1\fi 
l.59 \begin{document}
                     
! Missing \endcsname inserted.
<to be read again> 
                   \def 
l.59 \begin{document}
           
Execution halted