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

--- re-building ‘GauPro.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/GauPro.Rcheck/vign_test/GauPro/vignettes/GauPro_files/figure-html/unnamed-chunk-2-1.png
288x288 pixels, 8 bits/pixel, 253 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 3263 bytes
Input file size = 4112 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 2777
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 2772
  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 = 2772

Output IDAT size = 2772 bytes (491 bytes decrease)
Output file size = 2850 bytes (1262 bytes = 30.69% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/GauPro.Rcheck/vign_test/GauPro/vignettes/GauPro_files/figure-html/unnamed-chunk-3-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 7400 bytes
Input file size = 7478 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 5884
  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 = 5884

Output IDAT size = 5884 bytes (1516 bytes decrease)
Output file size = 5962 bytes (1516 bytes = 20.27% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/GauPro.Rcheck/vign_test/GauPro/vignettes/GauPro_files/figure-html/unnamed-chunk-5-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 10662 bytes
Input file size = 10752 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 8475
  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 = 8475

Output IDAT size = 8475 bytes (2187 bytes decrease)
Output file size = 8553 bytes (2199 bytes = 20.45% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/GauPro.Rcheck/vign_test/GauPro/vignettes/GauPro_files/figure-html/unnamed-chunk-6-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 16150 bytes
Input file size = 16240 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 12673
  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 = 12673

Output IDAT size = 12673 bytes (3477 bytes decrease)
Output file size = 12751 bytes (3489 bytes = 21.48% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/GauPro.Rcheck/vign_test/GauPro/vignettes/GauPro_files/figure-html/unnamed-chunk-7-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 5053 bytes
Input file size = 5911 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4430
  zc = 9  zm = 8  zs = 1  f = 0		IDAT size = 4403
  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 = 4403

Output IDAT size = 4403 bytes (650 bytes decrease)
Output file size = 4481 bytes (1430 bytes = 24.19% decrease)


Quitting from lines 97-102 [unnamed-chunk-8] (GauPro.Rmd)
Error: processing vignette 'GauPro.Rmd' failed with diagnostics:
there is no package called 'tidyr'
--- failed re-building ‘GauPro.Rmd’

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

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

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

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

Error: Vignette re-building failed.
Execution halted