Error(s) in re-building vignettes:
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--- re-building ‘simulating-data.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.

Attaching package: 'dplyr'

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Loading required package: Biobase
Loading required package: BiocGenerics
Loading required package: parallel

Attaching package: 'BiocGenerics'

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    clusterExport, clusterMap, parApply, parCapply, parLapply,
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Welcome to Bioconductor

    Vignettes contain introductory material; view with
    'browseVignettes()'. To cite Bioconductor, see
    'citation("Biobase")', and for packages 'citation("pkgname")'.

Loading required package: lattice

Attaching package: 'mice'

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Quitting from lines 109-113 (simulating-data.Rmd) 
Error: processing vignette 'simulating-data.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘simulating-data.Rmd’

SUMMARY: processing the following file failed:
  ‘simulating-data.Rmd’

Error: Vignette re-building failed.
Execution halted