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

--- re-building ‘ICD-10.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 'ICD-10.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘ICD-10.Rmd’

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

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

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

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

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

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

--- re-building ‘country-lang-vers.Rnw’ using Sweave
--- finished re-building ‘country-lang-vers.Rnw’

--- re-building ‘efficiency.Rnw’ using Sweave
--- finished re-building ‘efficiency.Rnw’

SUMMARY: processing the following files failed:
  ‘CMS-HCC.Rmd’ ‘ICD-10.Rmd’ ‘PCCC.Rmd’ ‘charlson-scores.Rmd’
  ‘compare-maps.Rmd’ ‘custom-maps.Rmd’ ‘introduction.Rmd’ ‘ranges.Rmd’

Error: Vignette re-building failed.
Execution halted