Error(s) in re-building vignettes:
  ...
--- re-building ‘Best_practices.Rmd’ using rmarkdown
--- finished re-building ‘Best_practices.Rmd’

--- re-building ‘Categorical_vars.Rmd’ using rmarkdown

Quitting from lines 26-31 [unnamed-chunk-2] (Categorical_vars.Rmd)
Error: processing vignette 'Categorical_vars.Rmd' failed with diagnostics:
cannot return a promise (PROMSXP) object
--- failed re-building ‘Categorical_vars.Rmd’

--- re-building ‘Speeding_up_anticlustering.Rmd’ using rmarkdown
--- finished re-building ‘Speeding_up_anticlustering.Rmd’

--- re-building ‘stimulus-selection.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/anticlust.Rcheck/vign_test/anticlust/vignettes/stimulus-selection_files/figure-html/similarity-plot-1.png
288x288 pixels, 8 bits/pixel, 255 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 5153 bytes
Input file size = 6008 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4583
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 4552
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 4552

Output IDAT size = 4552 bytes (601 bytes decrease)
Output file size = 4630 bytes (1378 bytes = 22.94% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/anticlust.Rcheck/vign_test/anticlust/vignettes/stimulus-selection_files/figure-html/unnamed-chunk-17-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 4874 bytes
Input file size = 5732 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4274
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4274

Output IDAT size = 4274 bytes (600 bytes decrease)
Output file size = 4352 bytes (1380 bytes = 24.08% decrease)

--- finished re-building ‘stimulus-selection.Rmd’

SUMMARY: processing the following file failed:
  ‘Categorical_vars.Rmd’

Error: Vignette re-building failed.
Execution halted