Error(s) in re-building vignettes:
  ...
--- re-building ‘forplo_vignette.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/forplo.Rcheck/vign_test/forplo/vignettes/forplo_vignette_files/figure-gfm/unnamed-chunk-1-1.png
768x480 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 21711 bytes
Input file size = 22593 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 20101
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 19878
  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 = 19878

Output IDAT size = 19878 bytes (1833 bytes decrease)
Output file size = 19956 bytes (2637 bytes = 11.67% decrease)

** Processing: /home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/forplo.Rcheck/vign_test/forplo/vignettes/forplo_vignette_files/figure-gfm/unnamed-chunk-2-1.png
768x480 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 23864 bytes
Input file size = 24746 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 22142
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 21937
  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 = 21937

Output IDAT size = 21937 bytes (1927 bytes decrease)
Output file size = 22015 bytes (2731 bytes = 11.04% decrease)


Quitting from lines 492-540 [unnamed-chunk-3] (forplo_vignette.Rmd)
Error: processing vignette 'forplo_vignette.Rmd' failed with diagnostics:
there is no package called 'meta'
--- failed re-building ‘forplo_vignette.Rmd’

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

Error: Vignette re-building failed.
Execution halted