Error(s) in re-building vignettes:
  ...
--- re-building ‘CalibrationCurves.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/CalibrationCurves.Rcheck/vign_test/CalibrationCurves/vignettes/CalibrationCurves_files/figure-html/unnamed-chunk-6-1.png
1344x960 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 90633 bytes
Input file size = 90843 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 72130
  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 = 72130

Output IDAT size = 72130 bytes (18503 bytes decrease)
Output file size = 72208 bytes (18635 bytes = 20.51% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/CalibrationCurves.Rcheck/vign_test/CalibrationCurves/vignettes/CalibrationCurves_files/figure-html/unnamed-chunk-9-1.png
1344x960 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 24256 bytes
Input file size = 25138 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20465
  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 = 20465

Output IDAT size = 20465 bytes (3791 bytes decrease)
Output file size = 20543 bytes (4595 bytes = 18.28% decrease)


Quitting from lines 206-207 [unnamed-chunk-10] (CalibrationCurves.Rmd)
Error: processing vignette 'CalibrationCurves.Rmd' failed with diagnostics:
Nk = 3 led to estimation problems.
--- failed re-building ‘CalibrationCurves.Rmd’

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

Error: Vignette re-building failed.
Execution halted