Error(s) in re-building vignettes:
  ...
--- re-building ‘intro_to_package.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/unnamed-chunk-3-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 16351 bytes
Input file size = 16441 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 15688
  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		IDAT size = 15442
  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 = 5		IDAT size = 15442

Output IDAT size = 15442 bytes (909 bytes decrease)
Output file size = 15520 bytes (921 bytes = 5.60% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/wass-1.png
576x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 59374 bytes
Input file size = 59536 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 57173
  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 = 57173

Output IDAT size = 57173 bytes (2201 bytes decrease)
Output file size = 57251 bytes (2285 bytes = 3.84% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/xpred-1.png
576x384 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 7196 bytes
Input file size = 8054 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 6400
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 6382
  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 = 6382

Output IDAT size = 6382 bytes (814 bytes decrease)
Output file size = 6460 bytes (1594 bytes = 19.79% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/nada-1.png
576x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 50632 bytes
Input file size = 50782 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 42831
  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 = 42831

Output IDAT size = 42831 bytes (7801 bytes decrease)
Output file size = 42909 bytes (7873 bytes = 15.50% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/htest-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 12513 bytes
Input file size = 12603 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 10219
  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 = 10219

Output IDAT size = 10219 bytes (2294 bytes decrease)
Output file size = 10297 bytes (2306 bytes = 18.30% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/htest-2.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 12699 bytes
Input file size = 12789 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 10027
  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 = 10027

Output IDAT size = 10027 bytes (2672 bytes decrease)
Output file size = 10105 bytes (2684 bytes = 20.99% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/biosensors.usc.Rcheck/vign_test/biosensors.usc/vignettes/intro_to_package_files/figure-html/clus-1.png
576x768 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 85149 bytes
Input file size = 85347 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 78267
  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 = 78267

Output IDAT size = 78267 bytes (6882 bytes decrease)
Output file size = 78345 bytes (7002 bytes = 8.20% decrease)


Quitting from lines 162-163 [unnamed-chunk-6] (intro_to_package.Rmd)
Error: processing vignette 'intro_to_package.Rmd' failed with diagnostics:
replacement has length zero
--- failed re-building ‘intro_to_package.Rmd’

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

Error: Vignette re-building failed.
Execution halted