failure when trying to install rnsf package with install_github

[LunaSare]

I'm getting the following error

Warning: file ‘grants.rda’ has magic number 'versi'
  Use of save versions prior to 2 is deprecated
Error in load(zfile, envir = envir) :
  bad restore file magic number (file may be corrupted) -- no data loaded
ERROR: lazydata failed for package ‘rnsf’

I browsed a bit and I found that it is recommended to save R package data with devtools::use_data(grants, internal = FALSE), to avoid bad configuration of files.

Here's the whole installation log:

> devtools::install_github("bomeara/rnsf")  # installing package is not working so downloaded data file for now
Downloading GitHub repo bomeara/rnsf@master
from URL https://api.github.com/repos/bomeara/rnsf/zipball/master
Installing rnsf
trying URL 'https://cloud.r-project.org/bin/macosx/el-capitan/contrib/3.5/tm_0.7-5.tgz'
Content type 'application/x-gzip' length 1081502 bytes (1.0 MB)
==================================================
downloaded 1.0 MB

Installing tm
Warning: unable to access index for repository https://datacube.wu.ac.at/bin/macosx/el-capitan/contrib/3.5:
  cannot open URL 'https://datacube.wu.ac.at/bin/macosx/el-capitan/contrib/3.5/PACKAGES'
trying URL 'https://cloud.r-project.org/bin/macosx/el-capitan/contrib/3.5/NLP_0.2-0.tgz'
Content type 'application/x-gzip' length 387932 bytes (378 KB)
==================================================
downloaded 378 KB

Installing NLP
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ  \
  --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/ss/2tpkp325521_kfgn59g44vd80000gn/T/RtmpyqELYw/devtools51d2a9f66b5/NLP'  \
  --library='/Library/Frameworks/R.framework/Versions/3.5/Resources/library'  \
  --install-tests

* installing *binary* package ‘NLP’ ...
* DONE (NLP)
Warning: unable to access index for repository https://datacube.wu.ac.at/bin/macosx/el-capitan/contrib/3.5:
  cannot open URL 'https://datacube.wu.ac.at/bin/macosx/el-capitan/contrib/3.5/PACKAGES'
trying URL 'https://cloud.r-project.org/bin/macosx/el-capitan/contrib/3.5/slam_0.1-43.tgz'
Content type 'application/x-gzip' length 201432 bytes (196 KB)
==================================================
downloaded 196 KB

Installing slam
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ  \
  --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/ss/2tpkp325521_kfgn59g44vd80000gn/T/RtmpyqELYw/devtools51d2a7cd9b0/slam'  \
  --library='/Library/Frameworks/R.framework/Versions/3.5/Resources/library'  \
  --install-tests

* installing *binary* package ‘slam’ ...
* DONE (slam)
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ  \
  --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/ss/2tpkp325521_kfgn59g44vd80000gn/T/RtmpyqELYw/devtools51d4687a2d5/tm'  \
  --library='/Library/Frameworks/R.framework/Versions/3.5/Resources/library'  \
  --install-tests

* installing *binary* package ‘tm’ ...
* DONE (tm)
trying URL 'https://cloud.r-project.org/bin/macosx/el-capitan/contrib/3.5/wordcloud_2.6.tgz'
Content type 'application/x-gzip' length 229178 bytes (223 KB)
==================================================
downloaded 223 KB

Installing wordcloud
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ  \
  --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/ss/2tpkp325521_kfgn59g44vd80000gn/T/RtmpyqELYw/devtools51d23016153/wordcloud'  \
  --library='/Library/Frameworks/R.framework/Versions/3.5/Resources/library'  \
  --install-tests

* installing *binary* package ‘wordcloud’ ...
* DONE (wordcloud)
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ  \
  --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/ss/2tpkp325521_kfgn59g44vd80000gn/T/RtmpyqELYw/devtools51d707c2bab/bomeara-rnsf-2fe2256'  \
  --library='/Library/Frameworks/R.framework/Versions/3.5/Resources/library'  \
  --install-tests

* installing *source* package ‘rnsf’ ...
** R
** data
*** moving datasets to lazyload DB
Warning: file ‘grants.rda’ has magic number 'versi'
  Use of save versions prior to 2 is deprecated
Error in load(zfile, envir = envir) :
  bad restore file magic number (file may be corrupted) -- no data loaded
ERROR: lazydata failed for package ‘rnsf’
* removing ‘/Library/Frameworks/R.framework/Versions/3.5/Resources/library/rnsf’
Installation failed: Command failed (1)