Error(s) in re-building vignettes:
  ...
--- re-building 'GADMTools_GRAPHICS.Rmd' using rmarkdown
Loading required package: sp
Loading required package: classInt
Loading required package: sf
Linking to GEOS 3.9.0, GDAL 3.2.1, PROJ 7.2.1
Loading required package: rgdal
rgdal: version: 1.5-23, (SVN revision 1121)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 3.2.1, released 2020/12/29
Path to GDAL shared files: /usr/share/gdal
GDAL binary built with GEOS: TRUE 
Loaded PROJ runtime: Rel. 7.2.1, January 1st, 2021, [PJ_VERSION: 721]
Path to PROJ shared files: /home/hornik/.local/share/proj:/usr/share/proj
PROJ CDN enabled: FALSE
Linking to sp version:1.4-5
To mute warnings of possible GDAL/OSR exportToProj4() degradation,
use options("rgdal_show_exportToProj4_warnings"="none") before loading rgdal.

Attaching package: 'GADMTools'

The following object is masked from 'package:utils':

    vignette

Joining, by = "NAME_4"
--- finished re-building 'GADMTools_GRAPHICS.Rmd'

--- re-building 'GADMTools_ISO_3166-1_alpha-3.Rmd' using rmarkdown
Loading required package: sp
Loading required package: classInt
Loading required package: sf
Linking to GEOS 3.9.0, GDAL 3.2.1, PROJ 7.2.1
Loading required package: rgdal
rgdal: version: 1.5-23, (SVN revision 1121)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 3.2.1, released 2020/12/29
Path to GDAL shared files: /usr/share/gdal
GDAL binary built with GEOS: TRUE 
Loaded PROJ runtime: Rel. 7.2.1, January 1st, 2021, [PJ_VERSION: 721]
Path to PROJ shared files: /home/hornik/.local/share/proj:/usr/share/proj
PROJ CDN enabled: FALSE
Linking to sp version:1.4-5
To mute warnings of possible GDAL/OSR exportToProj4() degradation,
use options("rgdal_show_exportToProj4_warnings"="none") before loading rgdal.

Attaching package: 'GADMTools'

The following object is masked from 'package:utils':

    vignette

Quitting from lines 19-27 (GADMTools_ISO_3166-1_alpha-3.Rmd) 
Error: processing vignette 'GADMTools_ISO_3166-1_alpha-3.Rmd' failed with diagnostics:
NA/NaN argument
--- failed re-building 'GADMTools_ISO_3166-1_alpha-3.Rmd'

--- re-building 'GADMTools_Manipulating_Shapefiles.Rmd' using rmarkdown
Loading required package: sp
Loading required package: classInt
Loading required package: sf
Linking to GEOS 3.9.0, GDAL 3.2.1, PROJ 7.2.1
Loading required package: rgdal
rgdal: version: 1.5-23, (SVN revision 1121)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 3.2.1, released 2020/12/29
Path to GDAL shared files: /usr/share/gdal
GDAL binary built with GEOS: TRUE 
Loaded PROJ runtime: Rel. 7.2.1, January 1st, 2021, [PJ_VERSION: 721]
Path to PROJ shared files: /home/hornik/.local/share/proj:/usr/share/proj
PROJ CDN enabled: FALSE
Linking to sp version:1.4-5
To mute warnings of possible GDAL/OSR exportToProj4() degradation,
use options("rgdal_show_exportToProj4_warnings"="none") before loading rgdal.

Attaching package: 'GADMTools'

The following object is masked from 'package:utils':

    vignette

Warning: attribute variables are assumed to be spatially constant throughout all geometries
Warning: LaTeX Warning: `h' float specifier changed to `ht'.
LaTeX Warning: `h' float specifier changed to `ht'.
LaTeX Warning: `h' float specifier changed to `ht'.
LaTeX Warning: `h' float specifier changed to `ht'.
LaTeX Warning: `h' float specifier changed to `ht'.
--- finished re-building 'GADMTools_Manipulating_Shapefiles.Rmd'

SUMMARY: processing the following file failed:
  'GADMTools_ISO_3166-1_alpha-3.Rmd'

Error: Vignette re-building failed.
Execution halted