Error(s) in re-building vignettes:
  ...
--- re-building ‘pkgnet-intro.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
* installing *source* package ‘baseballstats’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (baseballstats)

* installing *source* package ‘sartre’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (sartre)

* installing *source* package ‘milne’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (milne)

* installing *source* package ‘pkgnet’ ...
** package ‘pkgnet’ successfully unpacked and MD5 sums checked
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
** building package indices
** installing vignettes
** testing if installed package can be loaded from temporary location
** testing if installed package can be loaded from final location
** testing if installed package keeps a record of temporary installation path
* DONE (pkgnet)
Quitting from lines 77-113 (pkgnet-intro.Rmd) 
Error: processing vignette 'pkgnet-intro.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘pkgnet-intro.Rmd’

--- re-building ‘publishing-reports.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘publishing-reports.Rmd’

SUMMARY: processing the following file failed:
  ‘pkgnet-intro.Rmd’

Error: Vignette re-building failed.
Execution halted