Error(s) in re-building vignettes:
  ...
--- re-building ‘An_Introduction_to_packager.Rasciidoc’ using rasciidoc
Warning in run_knit(file_name, knit = knit, envir = envir, write_to_disk = write_to_disk) :
  Setting option knit to TRUE based on the file contents!


processing file: /home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/packager.Rcheck/vign_test/packager/vignettes/An_Introduction_to_packager.Rasciidoc
  ordinary text without R code

label: unnamed-chunk-1 (with options) 
List of 2
 $ results: chr "hide"
 $ message: logi FALSE

* Adding `.Rprofile` to /home/hornik/tmp/scratch/RtmpDP8AEx/myFirstPackage/.gitignore
* Adding `*.tar.gz` to /home/hornik/tmp/scratch/RtmpDP8AEx/myFirstPackage/.gitignore
* Adding `myFirstPackage.Rcheck` to /home/hornik/tmp/scratch/RtmpDP8AEx/myFirstPackage/.gitignore
* Creating `Makefile` from template.
* Adding `Makefile` to `.Rbuildignore`.
  ordinary text without R code

label: unnamed-chunk-2
  ordinary text without R code

label: unnamed-chunk-3
  ordinary text without R code

label: unnamed-chunk-4
  ordinary text without R code

label: unnamed-chunk-5
  ordinary text without R code

label: unnamed-chunk-6
  ordinary text without R code

label: unnamed-chunk-7 (with options) 
List of 2
 $ results: chr "hide"
 $ message: logi FALSE

* Adding `.Rprofile` to /home/hornik/tmp/scratch/RtmpDP8AEx/myOtherPackage/.gitignore
* Adding `*.tar.gz` to /home/hornik/tmp/scratch/RtmpDP8AEx/myOtherPackage/.gitignore
* Adding `myOtherPackage.Rcheck` to /home/hornik/tmp/scratch/RtmpDP8AEx/myOtherPackage/.gitignore
* Creating `Makefile` from template.
* Adding `Makefile` to `.Rbuildignore`.
label: unnamed-chunk-8
  ordinary text without R code

label: unnamed-chunk-9 (with options) 
List of 1
 $ eval: logi FALSE

label: unnamed-chunk-10 (with options) 
List of 1
 $ echo: logi FALSE

  ordinary text without R code

label: unnamed-chunk-11 (with options) 
List of 1
 $ eval: logi FALSE

   inline R code fragments

Quitting from lines 116-120 (/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/packager.Rcheck/vign_test/packager/vignettes/An_Introduction_to_packager.Rasciidoc) 
Error: processing vignette ‘An_Introduction_to_packager.Rasciidoc’ failed with diagnostics:
Error in loadNamespace(x): there is no package called 'devtools'

--- failed re-building ‘An_Introduction_to_packager.Rasciidoc’

SUMMARY: processing the following file failed:
  ‘An_Introduction_to_packager.Rasciidoc’

Error: Vignette re-building failed.
Execution halted