Error(s) in re-building vignettes:
--- re-building 'FuzzyNumbersTutorial.Rnw' using knitr
Loading required package: knitr
Warning in sprintf(paste("\\[", "{%s}_L(\\alpha) = \\left\\{", "\\begin{array}{lll}",  :
  one argument not used by format '\[
{%s}_L(\alpha) = \left\{
\begin{array}{lll}'
Warning in sprintf(paste("\\[", "{%s}_U(\\alpha) = \\left\\{", "\\begin{array}{lll}",  :
  one argument not used by format '\[
{%s}_U(\alpha) = \left\{
\begin{array}{lll}'
Warning in regularize.values(x, y, ties, missing(ties), na.rm = na.rm) :
  collapsing to unique 'x' values
Warning in regularize.values(x, y, ties, missing(ties), na.rm = na.rm) :
  collapsing to unique 'x' values
Warning in regularize.values(x, y, ties, missing(ties), na.rm = na.rm) :
  collapsing to unique 'x' values
Warning in regularize.values(x, y, ties, missing(ties), na.rm = na.rm) :
  collapsing to unique 'x' values
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:276: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:288: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:303: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:314: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:378: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:392: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:409: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:425: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:434: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:466: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:481: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:508: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:521: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:566: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:586: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:614: Package xcolor Error: Undefined co
lor `fgcolor'.

See the xcolor package documentation for explanation.
Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:632: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:641: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:662: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:684: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:717: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:787: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:861: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:898: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:914: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:923: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:952: Package xcolor Error: Undefined co
lor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1002: Package xcolor Error: Undefined c
olor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1102: Package xcolor Error: Undefined c
olor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1141: Package xcolor Error: Undefined c
olor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1156: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1220: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1251: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1277: Package xcolor Error: Undefined c
olor `fgcolor'.

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Type  H <return>  for immediate help.
bers/vignettes/FuzzyNumbersTutorial.tex:1293: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1332: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1358: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1410: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1425: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1449: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1460: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1483: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/FuzzyNumbersTutorial.tex:1493: Package xcolor Error: Undefined c
olor `fgcolor'.

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bers/vignettes/Fuzz
--- failed re-building 'FuzzyNumbersTutorial.Rnw'

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

Error: Vignette re-building failed.
Execution halted