Error(s) in re-building vignettes:
--- re-building ‘z1_install.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 'z1_install.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z1_install.Rmd’

--- re-building ‘z2_build.Rmd’ using rmarkdown

Attaching package: 'lubridate'

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

    date


Attaching package: 'dplyr'

The following objects are masked from 'package:lubridate':

    intersect, setdiff, union

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Parsed with column specification:
cols(
  id = col_double(),
  x = col_double(),
  y = col_double(),
  size = col_double(),
  frame = col_double(),
  track = col_double(),
  ignore = col_logical(),
  track_fixed = col_double()
)
Parsed with column specification:
cols(
  date = col_date(format = ""),
  time = col_time(format = ""),
  lon = col_double(),
  lat = col_double()
)
Warning: 2 parsing failures.
row  col   expected     actual                                                                                                file
 24 date valid date 2015-13-10 '/Volumes/Builds/packages/high-sierra-x86_64/results/4.0/trackdf.Rcheck/trackdf/extdata/gps/01.csv'
 34 time valid date 25:00:34   '/Volumes/Builds/packages/high-sierra-x86_64/results/4.0/trackdf.Rcheck/trackdf/extdata/gps/01.csv'

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 'z2_build.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z2_build.Rmd’

--- re-building ‘z3_manipulate.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 'z3_manipulate.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘z3_manipulate.Rmd’

SUMMARY: processing the following files failed:
  ‘z1_install.Rmd’ ‘z2_build.Rmd’ ‘z3_manipulate.Rmd’

Error: Vignette re-building failed.
Execution halted