Error(s) in re-building vignettes:
--- re-building 'confidence.Rnw' using knitr
Loading required package: tcltk

For more information on the usage of the Confidence tool, type:
vignette("confidence")
Examples of input files can be found in:
'C:/r_packages/pkgcheck/CRAN/confidence/confidence.Rcheck/confidence/extdata'
Warning in system(paste(shQuote(texi2dvi), if (quiet) "--quiet" else "",  :
  running command '"C:\PROGRA~1\MiKTeX\miktex\bin\x64\texify.exe" --quiet --pdf "confidence.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 'confidence.Rnw' failed with diagnostics:
running 'texi2dvi' on 'confidence.tex' failed

LaTeX errors:
ignettes/confidence.tex:195: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:280: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:291: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:301: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:316: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:325: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:337: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:393: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
ignettes/confidence.tex:411: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

--- failed re-building 'confidence.Rnw'

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

Error: Vignette re-building failed.
Execution halted