Error(s) in re-building vignettes:
--- re-building 'pavo-1-overview.Rmd' using rmarkdown
--- finished re-building 'pavo-1-overview.Rmd'

--- re-building 'pavo-2-importing_processing.Rmd' using rmarkdown
Welcome to pavo 2! Take a look at the latest features (and update your bibliography) in our recent publication: Maia R., Gruson H., Endler J. A., White T. E. (2019) pavo 2: new tools for the spectral and spatial analysis of colour in R. Methods in Ecology and Evolution, 10, 1097-1107.
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
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Warning in hook_png(before, options, envir, "pngquant", function(x) { :
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Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
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Warning in hook_png(before, options, envir, "pngquant", function(x) { :
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Quitting from lines 408-409 (pavo-2-importing_processing.Rmd) 
Error: processing vignette 'pavo-2-importing_processing.Rmd' failed with diagnostics:
Rterm.exe: Backing store not supported `C:\msys64\home\tomas\ucrt3\svn\ucrt3\r_packages\pkgcheck\CRAN\pavo\pavo.Rcheck\pavo\testdata\images\h_melpomene.jpg' @ error/jpeg.c/JPEGErrorHandler/343
--- failed re-building 'pavo-2-importing_processing.Rmd'

--- re-building 'pavo-3-analysing.Rmd' using rmarkdown
Welcome to pavo 2! Take a look at the latest features (and update your bibliography) in our recent publication: Maia R., Gruson H., Endler J. A., White T. E. (2019) pavo 2: new tools for the spectral and spatial analysis of colour in R. Methods in Ecology and Evolution, 10, 1097-1107.
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Calculating noise-weighted Euclidean distances and noise-weighted luminance contrasts
Calculating noise-weighted Euclidean distances
Calculating noise-weighted Euclidean distances
Calculating noise-weighted Euclidean distances
Calculating noise-weighted Euclidean distances
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
wavelengths found in column 1
processing options applied:
Scaling spectra to a maximum value of 1
wavelengths found in column 1
processing options applied:
Scaling spectra to a total area of 1
processing options applied:
Scaling spectra to a minimum value of zero
wavelengths found in column 1
Calculating noise-weighted Euclidean distances and noise-weighted luminance contrasts
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
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Warning in doTryCatch(return(expr), name, parentenv, handler) :
  zero-length arrow is of indeterminate angle and so skipped
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Warning in hook_png(before, options, envir, "pngquant", function(x) { :
  cannot find pngquant; please install and put it in PATH
Quitting from lines 775-776 (pavo-3-analysing.Rmd) 
Error: processing vignette 'pavo-3-analysing.Rmd' failed with diagnostics:
Rterm.exe: Backing store not supported `C:\msys64\home\tomas\ucrt3\svn\ucrt3\r_packages\pkgcheck\CRAN\pavo\pavo.Rcheck\pavo\testdata\images\h_melpomene.jpg' @ error/jpeg.c/JPEGErrorHandler/343
--- failed re-building 'pavo-3-analysing.Rmd'

--- re-building 'pavo-4-spectraldesc.Rmd' using rmarkdown
--- finished re-building 'pavo-4-spectraldesc.Rmd'

--- re-building 'pavo-5-alphashapes.Rmd' using rmarkdown
Loading required package: rgl
--- finished re-building 'pavo-5-alphashapes.Rmd'

SUMMARY: processing the following files failed:
  'pavo-2-importing_processing.Rmd' 'pavo-3-analysing.Rmd'

Error: Vignette re-building failed.
Execution halted