Error(s) in re-building vignettes:
  ...
--- re-building ‘break_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.
Loading required package: lattice
Loading required package: ggplot2
Quitting from lines 70-72 (break_caret.Rmd) 
Error: processing vignette 'break_caret.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_caret.Rmd’

--- re-building ‘break_glm.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.
Quitting from lines 41-47 (break_glm.Rmd) 
Error: processing vignette 'break_glm.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_glm.Rmd’

--- re-building ‘break_lm.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.
Quitting from lines 45-55 (break_lm.Rmd) 
Error: processing vignette 'break_lm.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_lm.Rmd’

--- re-building ‘break_randomForest.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.
Quitting from lines 44-61 (break_randomForest.Rmd) 
Error: processing vignette 'break_randomForest.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_randomForest.Rmd’

Cpu Limit Exceeded - core dumped
--- re-building ‘break_ranger.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- re-building ‘break_svm.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 60-63 (break_svm.Rmd) 
Error: processing vignette 'break_svm.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_svm.Rmd’

--- re-building ‘break_xgboost.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.
Quitting from lines 48-50 (break_xgboost.Rmd) 
Error: processing vignette 'break_xgboost.Rmd' failed with diagnostics:
there is no package called 'digest'
--- failed re-building ‘break_xgboost.Rmd’

SUMMARY: processing the following files failed:
  ‘break_caret.Rmd’ ‘break_glm.Rmd’ ‘break_lm.Rmd’
  ‘break_randomForest.Rmd’ ‘break_ranger.Rmd’ ‘break_svm.Rmd’
  ‘break_xgboost.Rmd’

Error: Vignette re-building failed.
Execution halted