Error(s) in re-building vignettes:
  ...
--- re-building ‘rnrfa-vignette.Rmd’ using rmarkdown
trying URL 'https://cloud.r-project.org/src/contrib/devtools_2.4.5.tar.gz'
Content type 'application/x-gzip' length 374718 bytes (365 KB)
==================================================
downloaded 365 KB

trying URL 'https://cloud.r-project.org/src/contrib/DT_0.33.tar.gz'
Content type 'application/x-gzip' length 1675674 bytes (1.6 MB)
==================================================
downloaded 1.6 MB

trying URL 'https://cloud.r-project.org/src/contrib/leaflet_2.2.2.tar.gz'
Content type 'application/x-gzip' length 1983642 bytes (1.9 MB)
==================================================
downloaded 1.9 MB

trying URL 'https://cloud.r-project.org/src/contrib/dygraphs_1.1.1.6.tar.gz'
Content type 'application/x-gzip' length 318939 bytes (311 KB)
==================================================
downloaded 311 KB

* installing *source* package ‘devtools’ ...
** package ‘devtools’ successfully unpacked and MD5 sums checked
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
** help
*** installing help indices
*** copying figures
** 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 (devtools)
* installing *source* package ‘DT’ ...
** package ‘DT’ 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 (DT)
* installing *source* package ‘leaflet’ ...
** package ‘leaflet’ successfully unpacked and MD5 sums checked
** using staged installation
** R
** data
*** moving datasets to lazyload DB
** inst
** 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 (leaflet)
* installing *source* package ‘dygraphs’ ...
** package ‘dygraphs’ 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
** 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 (dygraphs)

The downloaded source packages are in
	'/tmp/RtmpZz9PXg/downloaded_packages'

Quitting from lines 201-202 [unnamed-chunk-13] (rnrfa-vignette.Rmd)
Error: processing vignette 'rnrfa-vignette.Rmd' failed with diagnostics:
arguments imply differing number of rows: 0, 1
--- failed re-building ‘rnrfa-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘rnrfa-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted