Error(s) in re-building vignettes:
  ...
--- re-building ‘caret.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

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: lattice
Loading required package: ggplot2

Attaching package: 'caret'

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

    precision, recall

Quitting from lines 110-112 (caret.Rmd) 
Error: processing vignette 'caret.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘caret.Rmd’

--- re-building ‘flashlight.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

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


Attaching package: 'xgboost'

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

    slice

Quitting from lines 136-183 (flashlight.Rmd) 
Error: processing vignette 'flashlight.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘flashlight.Rmd’

--- re-building ‘mlr3.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

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: lattice
Loading required package: ggplot2

Attaching package: 'caret'

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

    precision, recall

Quitting from lines 105-107 (mlr3.Rmd) 
Error: processing vignette 'mlr3.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘mlr3.Rmd’

SUMMARY: processing the following files failed:
  ‘caret.Rmd’ ‘flashlight.Rmd’ ‘mlr3.Rmd’

Error: Vignette re-building failed.
Execution halted