Error(s) in re-building vignettes:
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--- re-building ‘cranly.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
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Quitting from lines 77-78 (cranly.Rmd) 
Error: processing vignette 'cranly.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘cranly.Rmd’

--- re-building ‘dependence_trees.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
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Quitting from lines 52-54 (dependence_trees.Rmd) 
Error: processing vignette 'dependence_trees.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘dependence_trees.Rmd’

--- re-building ‘extractors.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
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--- finished re-building ‘extractors.Rmd’

--- re-building ‘glms.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
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Quitting from lines 48-49 (glms.Rmd) 
Error: processing vignette 'glms.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘glms.Rmd’

SUMMARY: processing the following files failed:
  ‘cranly.Rmd’ ‘dependence_trees.Rmd’ ‘glms.Rmd’

Error: Vignette re-building failed.
Execution halted