Error(s) in re-building vignettes:
--- re-building ‘cladocera_ex.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 'cladocera_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘cladocera_ex.Rmd’

--- re-building ‘geese_ex.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 'geese_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘geese_ex.Rmd’

--- re-building ‘isopod_ex.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 'isopod_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘isopod_ex.Rmd’

--- re-building ‘killerwhale_ex.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 'killerwhale_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘killerwhale_ex.Rmd’

--- re-building ‘lake_ex.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 'lake_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘lake_ex.Rmd’

--- re-building ‘wolves_ex.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 'wolves_ex.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘wolves_ex.Rmd’

SUMMARY: processing the following files failed:
  ‘cladocera_ex.Rmd’ ‘geese_ex.Rmd’ ‘isopod_ex.Rmd’
  ‘killerwhale_ex.Rmd’ ‘lake_ex.Rmd’ ‘wolves_ex.Rmd’

Error: Vignette re-building failed.
Execution halted