Error(s) in re-building vignettes:
--- re-building ‘additional_parameters.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: sicegar
Loading required package: dplyr

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: ggplot2
--- finished re-building ‘additional_parameters.Rmd’

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

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: cowplot
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Warning in grid.Call(C_textBounds, as.graphicsAnnot(x$label), x$x, x$y,  :
  no font could be found for family "Arial"
Quitting from lines 85-94 (categorizing_fits.Rmd) 
Error: processing vignette 'categorizing_fits.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘categorizing_fits.Rmd’

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

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: ggplot2
--- finished re-building ‘fitting_individual_models.Rmd’

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

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: ggplot2
Loading required package: cowplot
Quitting from lines 57-71 (introduction.Rmd) 
Error: processing vignette 'introduction.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘introduction.Rmd’

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

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: ggplot2
Loading required package: cowplot
Quitting from lines 68-73 (plotting_fitted_models.Rmd) 
Error: processing vignette 'plotting_fitted_models.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘plotting_fitted_models.Rmd’

SUMMARY: processing the following files failed:
  ‘categorizing_fits.Rmd’ ‘introduction.Rmd’
  ‘plotting_fitted_models.Rmd’

Error: Vignette re-building failed.
Execution halted