Error(s) in re-building vignettes:
  ...
--- re-building ‘Introduction.Rmd’ using rmarkdown

Quitting from lines 17-21 [opts] (Introduction.Rmd)
Error: processing vignette 'Introduction.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘Introduction.Rmd’

--- re-building ‘User_models.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/growthrates.Rcheck/vign_test/growthrates/vignettes/User_models_files/figure-html/unnamed-chunk-4-1.png
480x384 pixels, 8 bits/pixel, 254 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 5041 bytes
Input file size = 5893 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4246
  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 = 4246

Output IDAT size = 4246 bytes (795 bytes decrease)
Output file size = 4324 bytes (1569 bytes = 26.62% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/growthrates.Rcheck/vign_test/growthrates/vignettes/User_models_files/figure-html/unnamed-chunk-5-1.png
480x384 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 14961 bytes
Input file size = 15051 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 12125
  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 = 12125

Output IDAT size = 12125 bytes (2836 bytes decrease)
Output file size = 12203 bytes (2848 bytes = 18.92% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/growthrates.Rcheck/vign_test/growthrates/vignettes/User_models_files/figure-html/unnamed-chunk-8-1.png
384x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 11395 bytes
Input file size = 11485 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 9384
  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 = 9384

Output IDAT size = 9384 bytes (2011 bytes decrease)
Output file size = 9462 bytes (2023 bytes = 17.61% decrease)

--- finished re-building ‘User_models.Rmd’

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

Error: Vignette re-building failed.
Execution halted