Error(s) in re-building vignettes:
--- re-building ‘browseMovebank.Rmd’ using rmarkdown
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'browseMovebank.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘browseMovebank.Rmd’

--- re-building ‘move.Rmd’ using rmarkdown
Loading required package: geosphere
Loading required package: sp
Loading required package: raster
Loading required package: rgdal
rgdal: version: 1.4-8, (SVN revision 845)
 Geospatial Data Abstraction Library extensions to R successfully loaded
 Loaded GDAL runtime: GDAL 2.4.2, released 2019/06/28
 Path to GDAL shared files: /Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.0/rgdal/gdal
 GDAL binary built with GEOS: FALSE 
 Loaded PROJ.4 runtime: Rel. 5.2.0, September 15th, 2018, [PJ_VERSION: 520]
 Path to PROJ.4 shared files: /Volumes/Builds/packages/high-sierra-x86_64/Rlib/4.0/rgdal/proj
 Linking to sp version: 1.4-1 

Attaching package: 'lubridate'

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

    date

Google's Terms of Service: https://cloud.google.com/maps-platform/terms/.
Please cite ggmap if you use it! See citation("ggmap") for details.
Loading required package: mapproj
Loading required package: maps
Checking rgeos availability: TRUE
Computational size: 7.3e+07
Warning in .local(object, raster, location.error = location.error, ext = ext,  :
  Some burst are omitted for variance calculation since there are not segements of interest
Computational size: 4.9e+06
Computational size: 9.9e+06
Computational size: 1.1e+07
Computational size: 8.5e+06
Computational size: 1.1e+07
Computational size: 3.8e+06
Computational size: 9.9e+06
Computational size: 8.5e+06
Computational size: 3.8e+06
Computational size: 7.0e+07
Computational size: 2.2e+09
Computational size: 7.3e+06
Warning in .local(object, raster, location.error = location.error, ext = ext,  :
  Some burst are omitted for variance calculation since there are not segements of interest
Computational size: 8.9e+05
Computational size: 1.8e+06
Computational size: 2.0e+06
Computational size: 1.6e+06
Computational size: 1.9e+06
Computational size: 7.1e+05
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'move.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘move.Rmd’

SUMMARY: processing the following files failed:
  ‘browseMovebank.Rmd’ ‘move.Rmd’

Error: Vignette re-building failed.
Execution halted