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

Quitting from lines 44-73 [unnamed-chunk-1] (explanation.Rmd)
Error: processing vignette 'explanation.Rmd' failed with diagnostics:
there is no package called 'survminer'
--- failed re-building ‘explanation.Rmd’

--- re-building ‘weighted_log_rank_tests.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/nphRCT.Rcheck/vign_test/nphRCT/vignettes/weighted_log_rank_tests_files/figure-html/7-1.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 11041 bytes
Input file size = 11131 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 7942
  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 = 7942

Output IDAT size = 7942 bytes (3099 bytes decrease)
Output file size = 8020 bytes (3111 bytes = 27.95% decrease)

** Processing: /home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/nphRCT.Rcheck/vign_test/nphRCT/vignettes/weighted_log_rank_tests_files/figure-html/7-2.png
288x288 pixels, 3x8 bits/pixel, RGB
Input IDAT size = 11157 bytes
Input file size = 11247 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 8069
  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 = 8069

Output IDAT size = 8069 bytes (3088 bytes decrease)
Output file size = 8147 bytes (3100 bytes = 27.56% decrease)

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

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

Error: Vignette re-building failed.
Execution halted