Error(s) in re-building vignettes:
  ...
--- re-building ‘bootCTvignette.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/bootCT.Rcheck/vign_test/bootCT/vignettes/bootCTvignette_files/figure-html/unnamed-chunk-9-1.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 71445 bytes
Input file size = 71619 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 70390
  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 = 69840
  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 = 69840

Output IDAT size = 69840 bytes (1605 bytes decrease)
Output file size = 69918 bytes (1701 bytes = 2.38% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/bootCT.Rcheck/vign_test/bootCT/vignettes/bootCTvignette_files/figure-html/unnamed-chunk-9-2.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 68785 bytes
Input file size = 68959 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0
  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 = 67419
  zc = 9  zm = 8  zs = 1  f = 5		IDAT size = 67397
  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 = 5		IDAT size = 67397

Output IDAT size = 67397 bytes (1388 bytes decrease)
Output file size = 67475 bytes (1484 bytes = 2.15% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/bootCT.Rcheck/vign_test/bootCT/vignettes/bootCTvignette_files/figure-html/unnamed-chunk-11-1.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 28406 bytes
Input file size = 28520 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 24012
  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 = 24012

Output IDAT size = 24012 bytes (4394 bytes decrease)
Output file size = 24090 bytes (4430 bytes = 15.53% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/bootCT.Rcheck/vign_test/bootCT/vignettes/bootCTvignette_files/figure-html/unnamed-chunk-11-2.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 42635 bytes
Input file size = 42773 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 36886
  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 = 36886

Output IDAT size = 36886 bytes (5749 bytes decrease)
Output file size = 36964 bytes (5809 bytes = 13.58% decrease)

Killed