Error(s) in re-building vignettes:
--- re-building ‘morocco.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: AER
Loading required package: car
Loading required package: carData
Loading required package: lmtest
Loading required package: zoo

Attaching package: 'zoo'

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

    as.Date, as.Date.numeric

Loading required package: sandwich
Loading required package: survival
Loading required package: np
Nonparametric Kernel Methods for Mixed Datatypes (version 0.60-11)
[vignette("np_faq",package="np") provides answers to frequently asked questions]
[vignette("np",package="np") an overview]
[vignette("entropy_np",package="np") an overview of entropy-based methods]
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Quitting from lines 86-87 (morocco.Rmd) 
Error: processing vignette 'morocco.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘morocco.Rmd’

--- re-building ‘rddtools.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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Quitting from lines 68-69 (rddtools.Rmd) 
Error: processing vignette 'rddtools.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘rddtools.Rmd’

SUMMARY: processing the following files failed:
  ‘morocco.Rmd’ ‘rddtools.Rmd’

Error: Vignette re-building failed.
Execution halted