Error(s) in re-building vignettes:
  ...
--- re-building ‘dggridR.Rmd’ using rmarkdown
Loading required package: rgdal
Loading required package: sp
rgdal: version: 1.5-10, (SVN revision 1006)
Geospatial Data Abstraction Library extensions to R successfully loaded
Loaded GDAL runtime: GDAL 3.0.4, released 2020/01/28
Path to GDAL shared files: /usr/share/gdal
GDAL binary built with GEOS: TRUE 
Loaded PROJ runtime: Rel. 7.0.1, May 1st, 2020, [PJ_VERSION: 701]
Path to PROJ shared files: /home/hornik/.local/share/proj:/usr/share/proj
PROJ CDN enabled:FALSE
Linking to sp version:1.4-2
To mute warnings of possible GDAL/OSR exportToProj4() degradation,
use options("rgdal_show_exportToProj4_warnings"="none") before loading rgdal.
Loading required package: ggplot2
Loading required package: dplyr

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

`summarise()` ungrouping output (override with `.groups` argument)
`summarise()` ungrouping output (override with `.groups` argument)
`summarise()` ungrouping output (override with `.groups` argument)
`summarise()` ungrouping output (override with `.groups` argument)
Regions defined for each Polygons
pandoc-citeproc: Error in $: Incompatible API versions: encoded with [1,20] but attempted to decode with [1,17,5,4].
CallStack (from HasCallStack):
  error, called at ./Text/Pandoc/JSON.hs:111:48 in pandoc-types-1.17.5.4-5tHZ3B61A58JaKOMxwGQR4:Text.Pandoc.JSON
Error running filter /usr/bin/pandoc-citeproc:
Filter returned error status 1
Error: processing vignette 'dggridR.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building ‘dggridR.Rmd’

--- re-building ‘dggrid_v62_manual.pdf.asis’ using asis
--- finished re-building ‘dggrid_v62_manual.pdf.asis’

SUMMARY: processing the following file failed:
  ‘dggridR.Rmd’

Error: Vignette re-building failed.
Execution halted