Error(s) in re-building vignettes:
  ...
--- re-building ‘basic_functionalities.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/npsurvSS.Rcheck/vign_test/npsurvSS/vignettes/basic_functionalities_files/figure-html/unnamed-chunk-4-1.png
288x288 pixels, 8 bits/pixel, 256 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 4714 bytes
Input file size = 5572 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4208
  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 = 4208

Output IDAT size = 4208 bytes (506 bytes decrease)
Output file size = 4286 bytes (1286 bytes = 23.08% decrease)

** Processing: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/npsurvSS.Rcheck/vign_test/npsurvSS/vignettes/basic_functionalities_files/figure-html/unnamed-chunk-5-1.png
288x288 pixels, 8 bits/pixel, 255 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 4801 bytes
Input file size = 5656 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 4171
  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 = 4171

Output IDAT size = 4171 bytes (630 bytes decrease)
Output file size = 4249 bytes (1407 bytes = 24.88% decrease)

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

--- re-building ‘example1.Rmd’ using rmarkdown

Quitting from lines 22-27 [unnamed-chunk-1] (example1.Rmd)
Error: processing vignette 'example1.Rmd' failed with diagnostics:
there is no package called 'dplyr'
--- failed re-building ‘example1.Rmd’

--- re-building ‘example2.Rmd’ using rmarkdown

Quitting from lines 22-27 [unnamed-chunk-1] (example2.Rmd)
Error: processing vignette 'example2.Rmd' failed with diagnostics:
there is no package called 'dplyr'
--- failed re-building ‘example2.Rmd’

SUMMARY: processing the following files failed:
  ‘example1.Rmd’ ‘example2.Rmd’

Error: Vignette re-building failed.
Execution halted