Error(s) in re-building vignettes:
  ...
--- re-building ‘example.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rhosa.Rcheck/vign_test/rhosa/vignettes/example_files/figure-html/ts-1.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 37151 bytes
Input file size = 37277 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 = 35340
  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 = 35340

Output IDAT size = 35340 bytes (1811 bytes decrease)
Output file size = 35418 bytes (1859 bytes = 4.99% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rhosa.Rcheck/vign_test/rhosa/vignettes/example_files/figure-html/psd-1.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 31936 bytes
Input file size = 32050 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 = 29166
  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 = 29166

Output IDAT size = 29166 bytes (2770 bytes decrease)
Output file size = 29244 bytes (2806 bytes = 8.76% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rhosa.Rcheck/vign_test/rhosa/vignettes/example_files/figure-html/psd-2.png
672x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 33159 bytes
Input file size = 33285 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 32431
  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 = 31005
  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 = 31005

Output IDAT size = 31005 bytes (2154 bytes decrease)
Output file size = 31083 bytes (2202 bytes = 6.62% decrease)


Quitting from lines 97-105 [plot_bicoherence] (example.Rmd)
Error: processing vignette 'example.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘example.Rmd’

--- re-building ‘quadratic_phase_coupling.Rmd’ using rmarkdown

Quitting from lines 102-116 [sec1_samples] (quadratic_phase_coupling.Rmd)
Error: processing vignette 'quadratic_phase_coupling.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘quadratic_phase_coupling.Rmd’

SUMMARY: processing the following files failed:
  ‘example.Rmd’ ‘quadratic_phase_coupling.Rmd’

Error: Vignette re-building failed.
Execution halted