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

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

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

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

SUMMARY: processing the following files failed:
  ‘async_evaluator.Rmd’ ‘r_expr_addons.Rmd’
  ‘shiny_customized_widgets.Rmd’ ‘utility_functions.Rmd’

Error: Vignette re-building failed.
Execution halted