Error(s) in re-building vignettes:
--- re-building 'memgeneTutorial.Rnw' using knitr
Warning in system(paste(shQuote(texi2dvi), if (quiet) "--quiet" else "",  :
  running command '"C:\PROGRA~1\MiKTeX\miktex\bin\x64\texify.exe" --quiet --pdf "memgeneTutorial.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 'memgeneTutorial.Rnw' failed with diagnostics:
running 'texi2dvi' on 'memgeneTutorial.tex' failed

LaTeX errors:
memgeneTutorial.tex:141: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
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memgeneTutorial.tex:160: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:169: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
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memgeneTutorial.tex:178: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:195: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:212: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
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memgeneTutorial.tex:225: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:274: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:283: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:292: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:305: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:322: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:343: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:358: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:367: Package xcolor Error: Undefined color `fgcolor'.

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

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:426: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:441: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:458: Package xcolor Error: Undefined color `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:472: Package xcolor Error: Undefined color `shadecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:500: Package xcolor Error: Undefined color `shadecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:500: Package xcolor Error: Undefined color `shadecolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              
memgeneTutorial.tex:506: Package xcolor Error: Undefined color `fgcolor'.

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

--- failed re-building 'memgeneTutorial.Rnw'

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

Error: Vignette re-building failed.
Execution halted