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

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

Quitting from lines 27-65 [unnamed-chunk-1] (ErrorEuler.Rmd)
Error: processing vignette 'ErrorEuler.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘ErrorEuler.Rmd’

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

Quitting from lines 103-147 [unnamed-chunk-2] (FallingParticle.Rmd)
Error: processing vignette 'FallingParticle.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘FallingParticle.Rmd’

--- re-building ‘Kepler.Rmd’ using rmarkdown
--- finished re-building ‘Kepler.Rmd’

--- re-building ‘Muskat-MBal.Rmd’ using rmarkdown

Quitting from lines 51-89 [unnamed-chunk-1] (Muskat-MBal.Rmd)
Error: processing vignette 'Muskat-MBal.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘Muskat-MBal.Rmd’

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

Quitting from lines 87-132 [unnamed-chunk-2] (Pendulum.Rmd)
Error: processing vignette 'Pendulum.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘Pendulum.Rmd’

--- re-building ‘Planet.Rmd’ using rmarkdown
--- finished re-building ‘Planet.Rmd’

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

Quitting from lines 16-88 [unnamed-chunk-1] (Projectile.Rmd)
Error: processing vignette 'Projectile.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘Projectile.Rmd’

--- re-building ‘Reaction.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rODE.Rcheck/vign_test/rODE/vignettes/Reaction_files/figure-html/unnamed-chunk-2-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 11616 bytes
Input file size = 12486 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 11065
  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 = 11065

Output IDAT size = 11065 bytes (551 bytes decrease)
Output file size = 11143 bytes (1343 bytes = 10.76% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rODE.Rcheck/vign_test/rODE/vignettes/Reaction_files/figure-html/unnamed-chunk-2-2.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 12356 bytes
Input file size = 13226 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 11883
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 11584
  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 = 11584

Output IDAT size = 11584 bytes (772 bytes decrease)
Output file size = 11662 bytes (1564 bytes = 11.83% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/rODE.Rcheck/vign_test/rODE/vignettes/Reaction_files/figure-html/unnamed-chunk-2-3.png
288x288 pixels, 8 bits/pixel, 254 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 5230 bytes
Input file size = 6082 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4607
  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 = 4607

Output IDAT size = 4607 bytes (623 bytes decrease)
Output file size = 4685 bytes (1397 bytes = 22.97% decrease)

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

SUMMARY: processing the following files failed:
  ‘ErrorEuler.Rmd’ ‘FallingParticle.Rmd’ ‘Muskat-MBal.Rmd’
  ‘Pendulum.Rmd’ ‘Projectile.Rmd’

Error: Vignette re-building failed.
Execution halted