Error(s) in re-building vignettes:
--- re-building 'colorSpec-guide.Rmd' using rmarkdown
--- finished re-building 'colorSpec-guide.Rmd'

--- re-building 'phenolred.Rmd' using rmarkdown
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows

Attaching package: 'spacesRGB'

The following objects are masked from 'package:colorSpec':

    RGBfromXYZ, metadata, metadata<-

--- finished re-building 'phenolred.Rmd'

--- re-building 'photoncounting.Rmd' using rmarkdown
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows
--- finished re-building 'photoncounting.Rmd'

--- re-building 'blueflame.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows

Attaching package: 'spacesRGB'

The following objects are masked from 'package:colorSpec':

    RGBfromXYZ, metadata, metadata<-

--- finished re-building 'blueflame.rnw'

--- re-building 'emulation.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows

Attaching package: 'spacesRGB'

The following objects are masked from 'package:colorSpec':

    RGBfromXYZ, metadata, metadata<-

07:07:35.545 WARN  colorSpec::product.colorSpec(). The returned matrix is ambiguous; because it depends on the splitting. Inspect the matrix carefully. 
07:07:35.576 WARN  colorSpec::product.colorSpec(). The returned matrix is ambiguous; because it depends on the splitting. Inspect the matrix carefully. 
--- finished re-building 'emulation.rnw'

--- re-building 'gallery.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows

Attaching package: 'spacesRGB'

The following objects are masked from 'package:colorSpec':

    RGBfromXYZ, metadata, metadata<-

--- finished re-building 'gallery.rnw'

--- re-building 'inversion.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows
--- finished re-building 'inversion.rnw'

--- re-building 'lens-aging.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows

Attaching package: 'spacesRGB'

The following objects are masked from 'package:colorSpec':

    RGBfromXYZ, metadata, metadata<-

Warning in system(paste(shQuote(texi2dvi), if (quiet) "--quiet" else "",  :
  running command '"D:\compiler\texmf\miktex\bin\texify.exe" --quiet --pdf "lens-aging.tex" --max-iterations=20 -I "D:/RCompile/recent/R-3.6.0/share/texmf/tex/latex" -I "D:/RCompile/recent/R-3.6.0/share/texmf/bibtex/bst"' had status 1
Error: processing vignette 'lens-aging.rnw' failed with diagnostics:
Failed to locate the 'texi2pdf' output file (by engine 'knitr::knitr') for vignette with name 'lens-aging'. The following files exist in directory '.': '1200px-Spectrum_of_blue_flame_-_intensity_corrected.png', 'CIExy1931_AdobeRGB_vs_sRGB.jpg', 'MacbethCC.txt', 'bibliography.bib', 'blueflame.R', 'blueflame.aux', 'blueflame.bbl', 'blueflame.bib', 'blueflame.blg', 'blueflame.log', 'blueflame.out', 'blueflame.pdf', 'blueflame.rnw', 'blueflame.tex', 'colorSpec-guide.R', 'colorSpec-guide.Rmd', 'colorSpec-guide.html', 'emulation.R', 'emulation.aux', 'emulation.bbl', 'emulation.blg', 'emulation.log', 'emulation.out', 'emulation.pdf', 'emulation.rnw', 'emulation.tex', 'gallery.R', 'gallery.aux', 'gallery.bbl', 'gallery.bib', 'gallery.blg', 'gallery.log', 'gallery.out', 'gallery.pdf', 'gallery.rnw', 'gallery.tex', 'institute-of-mathematical-statistics.csl', 'inversion.R', 'inversion.aux', 'inversion.bbl', 'inversion.blg', 'inversion.log', 'inversion.out', 'inversion.pdf', 'inversion.rnw', 'inversion.tex', 'invert-help.R', 'iso690-numeric-brackets-cs.csl', 'iso690-numeric-en.csl', 'lens-aging.R', 'lens-aging.bib', 'lens-aging.rnw', 'lens-aging.tex', 'optimal-help.R', 'optimals.bib', 'optimals.rnw', 'personal.csl', 'phenolred.R', 'phenolred.Rmd', 'phenolred.html', 'photoncounting.R', 'photoncounting.Rmd', 'photoncounting.html', 'proofs.txt', 'right-inverse.txt'
--- failed re-building 'lens-aging.rnw'

--- re-building 'optimals.rnw' using knitr
This is colorSpec.  Version: 0.8-3.  Author: Glenn Davis [aut, cre].  Built: R 3.6.0; ; 2019-04-30 11:37:35 UTC; windows
--- finished re-building 'optimals.rnw'

SUMMARY: processing the following file failed:
  'lens-aging.rnw'

Error: Vignette re-building failed.
Execution halted