Error(s) in re-building vignettes:
--- re-building ‘plot3logit-overview.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: ggtern
Loading required package: ggplot2
--
Remember to cite, run citation(package = 'ggtern') for further info.
--

Attaching package: 'ggtern'

The following objects are masked from 'package:ggplot2':

    aes, annotate, ggplot, ggplotGrob, ggplot_build, ggplot_gtable,
    ggsave, layer_data, theme_bw, theme_classic, theme_dark,
    theme_gray, theme_light, theme_linedraw, theme_minimal, theme_void

Loading required package: Ternary
Loading required package: dfidx

Attaching package: 'dfidx'

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

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

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Attaching package: 'ordinal'

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Loading required package: stats4
Loading required package: splines

Attaching package: 'VGAM'

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

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

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Error: processing vignette 'plot3logit-overview.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘plot3logit-overview.Rmd’

SUMMARY: processing the following file failed:
  ‘plot3logit-overview.Rmd’

Error: Vignette re-building failed.
Execution halted