Error(s) in re-building vignettes:
  ...
--- re-building ‘basics.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/stacks.Rcheck/vign_test/stacks/vignettes/basics_files/figure-html/unnamed-chunk-4-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 26881 bytes
Input file size = 26995 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20284
  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 = 20284

Output IDAT size = 20284 bytes (6597 bytes decrease)
Output file size = 20362 bytes (6633 bytes = 24.57% decrease)


Quitting from basics.Rmd:196-209 [unnamed-chunk-11]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NULL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'basics.Rmd' failed with diagnostics:
Package install is required for kknn.
--- failed re-building ‘basics.Rmd’

--- re-building ‘classification.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/stacks.Rcheck/vign_test/stacks/vignettes/classification_files/figure-html/unnamed-chunk-4-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 27815 bytes
Input file size = 27929 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20659
  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 = 20659

Output IDAT size = 20659 bytes (7156 bytes decrease)
Output file size = 20737 bytes (7192 bytes = 25.75% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/stacks.Rcheck/vign_test/stacks/vignettes/classification_files/figure-html/penalty-plot-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 8712 bytes
Input file size = 9582 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 8152
  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 = 8152

Output IDAT size = 8152 bytes (560 bytes decrease)
Output file size = 8230 bytes (1352 bytes = 14.11% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/stacks.Rcheck/vign_test/stacks/vignettes/classification_files/figure-html/members-plot-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 6607 bytes
Input file size = 7465 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 6134
  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 = 6134

Output IDAT size = 6134 bytes (473 bytes decrease)
Output file size = 6212 bytes (1253 bytes = 16.78% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/stacks.Rcheck/vign_test/stacks/vignettes/classification_files/figure-html/weight-plot-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 18567 bytes
Input file size = 18669 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 13162
  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 = 13162

Output IDAT size = 13162 bytes (5405 bytes decrease)
Output file size = 13240 bytes (5429 bytes = 29.08% decrease)

--- finished re-building ‘classification.Rmd’

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

Error: Vignette re-building failed.
Execution halted