Error(s) in re-building vignettes:
--- re-building ‘Creating_a_confusion_matrix.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 109-113 (Creating_a_confusion_matrix.Rmd) 
Error: processing vignette 'Creating_a_confusion_matrix.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘Creating_a_confusion_matrix.Rmd’

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

--- re-building ‘cross_validating_custom_functions.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) 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

Quitting from lines 763-774 (cross_validating_custom_functions.Rmd) 
Error: processing vignette 'cross_validating_custom_functions.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘cross_validating_custom_functions.Rmd’

--- re-building ‘evaluate_by_id.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) 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

Quitting from lines 110-115 (evaluate_by_id.Rmd) 
Error: processing vignette 'evaluate_by_id.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘evaluate_by_id.Rmd’

--- re-building ‘picking_the_number_of_folds_for_cross-validation.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) 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

`geom_smooth()` using formula 'y ~ x'
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_stringMetric, as.graphicsAnnot(x$label)) :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 76-137 (picking_the_number_of_folds_for_cross-validation.Rmd) 
Error: processing vignette 'picking_the_number_of_folds_for_cross-validation.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘picking_the_number_of_folds_for_cross-validation.Rmd’

SUMMARY: processing the following files failed:
  ‘Creating_a_confusion_matrix.Rmd’
  ‘cross_validating_custom_functions.Rmd’ ‘evaluate_by_id.Rmd’
  ‘picking_the_number_of_folds_for_cross-validation.Rmd’

Error: Vignette re-building failed.
Execution halted