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

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

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

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

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

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

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

SUMMARY: processing the following files failed:
  ‘Dark-Theme.Rmd’ ‘Gadgets.Rmd’ ‘Single-Layout.Rmd’ ‘Split-Layout.Rmd’
  ‘Tabs-Layout.Rmd’ ‘getting-started.Rmd’ ‘shinyMobile_tools.Rmd’

Error: Vignette re-building failed.
Execution halted