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

LaTeX errors:
bers/vignettes/FuzzyNumbersTutorial.tex:280: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:292: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:307: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:318: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:382: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:396: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:413: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:429: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:438: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:470: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:485: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:512: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:525: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:570: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:590: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:618: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:636: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:645: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:666: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:688: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:721: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:791: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:865: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:902: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:918: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:927: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:956: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1006: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1106: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1145: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1160: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1224: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1255: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1281: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1297: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1336: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1362: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1414: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1429: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1453: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1464: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1487: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1497: Package xcolor Error: Undefined c
olor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/Fuzz
--- failed re-building 'FuzzyNumbersTutorial.Rnw'

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

Error: Vignette re-building failed.
Execution halted