Error(s) in re-building vignettes:
--- re-building 'smacof.Rnw' using knitr
Loading required package: plotrix
Loading required package: colorspace
Loading required package: e1071

Attaching package: 'smacof'

The following object is masked from 'package:base':

    transform

Loading required package: gnm
Warning in system(paste(shQuote(texi2dvi), if (quiet) "--quiet" else "",  :
  running command '"C:\PROGRA~1\MiKTeX\miktex\bin\x64\texify.exe" --quiet --pdf "smacof.tex" --max-iterations=20 -I "C:/r_packages/rinst/share/texmf/tex/latex" -I "C:/r_packages/rinst/share/texmf/bibtex/bst"' had status 1
Error: processing vignette 'smacof.Rnw' failed with diagnostics:
running 'texi2dvi' on 'smacof.tex' failed

LaTeX errors:
cof.tex:471: LaTeX Error: Not in outer par mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:477: LaTeX Error: Command \bfseries invalid in math mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:477: LaTeX Error: Command \ttfamily invalid in math mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:477: LaTeX Error: Command \bfseries invalid in math mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:679: LaTeX Error: Not in outer par mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:723: LaTeX Error: Not in outer par mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
cof.tex:834: LaTeX Error: Not in outer par mode.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              

--- failed re-building 'smacof.Rnw'

SUMMARY: processing the following file failed:
  'smacof.Rnw'

Error: Vignette re-building failed.
Execution halted