Error(s) in re-building vignettes:
  ...
--- re-building 'ref-icar-vignette.Rmd' using rmarkdown
Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-2'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

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.
Warning in OGRSpatialRef(dsn, layer, morphFromESRI = morphFromESRI, dumpSRS = dumpSRS,  :
  Discarded datum D_unknown in CRS definition: +proj=longlat +ellps=clrk66 +no_defs
Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-3'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-4'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-5'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-6'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in OGRSpatialRef(dsn, layer, morphFromESRI = morphFromESRI, dumpSRS = dumpSRS,  :
  Discarded datum D_unknown in CRS definition: +proj=longlat +ellps=clrk66 +no_defs
Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-7'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-8'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-9'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-10'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-11'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in block_exec(params) :
  Failed to tidy R code in chunk 'unnamed-chunk-12'. Reason:
Error in loadNamespace(name) : there is no package called 'formatR'

Warning in OGRSpatialRef(dsn, layer, morphFromESRI = morphFromESRI, dumpSRS = dumpSRS,  :
  Discarded datum D_unknown in CRS definition: +proj=longlat +ellps=clrk66 +no_defs
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 'ref-icar-vignette.Rmd' failed with diagnostics:
pandoc document conversion failed with error 83
--- failed re-building 'ref-icar-vignette.Rmd'

SUMMARY: processing the following file failed:
  'ref-icar-vignette.Rmd'

Error: Vignette re-building failed.
Execution halted