Error(s) in re-building vignettes:
--- re-building ‘SongEvo.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
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Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'Hmisc'

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

    format.pval, units

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Quitting from lines 245-265 (SongEvo.Rmd) 
Error: processing vignette 'SongEvo.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘SongEvo.Rmd’

SUMMARY: processing the following file failed:
  ‘SongEvo.Rmd’

Error: Vignette re-building failed.
Execution halted