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

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

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

--- re-building ‘how-to-make-heuristic.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 'how-to-make-heuristic.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘how-to-make-heuristic.Rmd’

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

SUMMARY: processing the following files failed:
  ‘README.Rmd’ ‘confusion-matrix.Rmd’ ‘cross-validation.Rmd’
  ‘how-to-make-heuristic.Rmd’ ‘reproducing-results.Rmd’

Error: Vignette re-building failed.
Execution halted