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

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

--- re-building ‘understanding_sortable_js.Rmd’ using rmarkdown

Attaching package: 'base64'

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

    img

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

SUMMARY: processing the following files failed:
  ‘novel_solutions.Rmd’ ‘shiny_apps.Rmd’
  ‘understanding_sortable_js.Rmd’

Error: Vignette re-building failed.
Execution halted