Error(s) in re-building vignettes:
--- re-building ‘automatic_groups_with_groupdata2.Rmd’ using rmarkdown

Attaching package: 'dplyr'

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

    filter, lag

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

    intersect, setdiff, setequal, union

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 'automatic_groups_with_groupdata2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘automatic_groups_with_groupdata2.Rmd’

--- re-building ‘cross-validation_with_groupdata2.Rmd’ using rmarkdown

Attaching package: 'dplyr'

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

    filter, lag

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

    intersect, setdiff, setequal, union

Loading required package: lme4
Loading required package: Matrix

Attaching package: 'lmerTest'

The following object is masked from 'package:lme4':

    lmer

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

    step

Loading required package: zoo

Attaching package: 'zoo'

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

    as.Date, as.Date.numeric

boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
boundary (singular) fit: see ?isSingular
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_with_groupdata2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘cross-validation_with_groupdata2.Rmd’

--- re-building ‘description_of_groupdata2.Rmd’ using rmarkdown

Attaching package: 'dplyr'

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

    filter, lag

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

    intersect, setdiff, setequal, union

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 'description_of_groupdata2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘description_of_groupdata2.Rmd’

--- re-building ‘introduction_to_groupdata2.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_to_groupdata2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘introduction_to_groupdata2.Rmd’

--- re-building ‘time_series_with_groupdata2.Rmd’ using rmarkdown

Attaching package: 'dplyr'

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

    filter, lag

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

    intersect, setdiff, setequal, union

Don't know how to automatically pick scale for object of type ts. Defaulting to continuous.
Warning in mutate_impl(.data, dots, caller_env()) :
  Unequal factor levels: coercing to character
Warning in mutate_impl(.data, dots, caller_env()) :
  binding character and factor vector, coercing into character vector
Warning in mutate_impl(.data, dots, caller_env()) :
  binding character and factor vector, coercing into character vector
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 'time_series_with_groupdata2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘time_series_with_groupdata2.Rmd’

SUMMARY: processing the following files failed:
  ‘automatic_groups_with_groupdata2.Rmd’
  ‘cross-validation_with_groupdata2.Rmd’
  ‘description_of_groupdata2.Rmd’ ‘introduction_to_groupdata2.Rmd’
  ‘time_series_with_groupdata2.Rmd’

Error: Vignette re-building failed.
Execution halted