Error(s) in re-building vignettes:
  ...
--- re-building ‘Introduction.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/mdendro.Rcheck/vign_test/mdendro/vignettes/Introduction_files/figure-html/unnamed-chunk-4-1.png
1344x960 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 24039 bytes
Input file size = 24921 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20630
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 20377
  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 = 20377

Output IDAT size = 20377 bytes (3662 bytes decrease)
Output file size = 20455 bytes (4466 bytes = 17.92% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/mdendro.Rcheck/vign_test/mdendro/vignettes/Introduction_files/figure-html/unnamed-chunk-6-1.png
1344x960 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 22733 bytes
Input file size = 23615 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 18400
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 18325
  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 = 18325

Output IDAT size = 18325 bytes (4408 bytes decrease)
Output file size = 18403 bytes (5212 bytes = 22.07% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/mdendro.Rcheck/vign_test/mdendro/vignettes/Introduction_files/figure-html/unnamed-chunk-7-1.png
1344x960 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 36014 bytes
Input file size = 36920 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 31958
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 31920
  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 = 31920

Output IDAT size = 31920 bytes (4094 bytes decrease)
Output file size = 31998 bytes (4922 bytes = 13.33% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/mdendro.Rcheck/vign_test/mdendro/vignettes/Introduction_files/figure-html/unnamed-chunk-8-1.png
1344x960 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 29417 bytes
Input file size = 30311 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 25229
  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 = 25229

Output IDAT size = 25229 bytes (4188 bytes decrease)
Output file size = 25307 bytes (5004 bytes = 16.51% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/mdendro.Rcheck/vign_test/mdendro/vignettes/Introduction_files/figure-html/unnamed-chunk-10-1.png
1344x960 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 63588 bytes
Input file size = 63750 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 50785
  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 = 50785

Output IDAT size = 50785 bytes (12803 bytes decrease)
Output file size = 50863 bytes (12887 bytes = 20.21% decrease)


Quitting from lines 170-187 [unnamed-chunk-11] (Introduction.Rmd)
Error: processing vignette 'Introduction.Rmd' failed with diagnostics:
there is no package called 'dendextend'
--- failed re-building ‘Introduction.Rmd’

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

Error: Vignette re-building failed.
Execution halted