Error(s) in re-building vignettes:
  ...
--- re-building ‘animate.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.
Quitting from lines 28-44 (animate.Rmd) 
Error: processing vignette 'animate.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘animate.Rmd’

--- re-building ‘buttons.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.
Quitting from lines 51-65 (buttons.Rmd) 
Error: processing vignette 'buttons.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘buttons.Rmd’

--- re-building ‘cluster.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.
Quitting from lines 24-32 (cluster.Rmd) 
Error: processing vignette 'cluster.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘cluster.Rmd’

--- re-building ‘dynamic.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.
Quitting from lines 27-45 (dynamic.Rmd) 
Error: processing vignette 'dynamic.Rmd' failed with diagnostics:
Assigned data `runif(15, 500, 750)` must be compatible with existing data.
✖ Existing data has 75 rows.
✖ Assigned data has 15 rows.
ℹ Only vectors of size 1 are recycled.
--- failed re-building ‘dynamic.Rmd’

--- re-building ‘formats.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.
Quitting from lines 28-33 (formats.Rmd) 
Error: processing vignette 'formats.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘formats.Rmd’

--- re-building ‘get_started.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.
Quitting from lines 70-77 (get_started.Rmd) 
Error: processing vignette 'get_started.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘get_started.Rmd’

--- re-building ‘layout.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.
Quitting from lines 26-34 (layout.Rmd) 
Error: processing vignette 'layout.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘layout.Rmd’

--- re-building ‘plugins.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.
Quitting from lines 44-58 (plugins.Rmd) 
Error: processing vignette 'plugins.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘plugins.Rmd’

--- re-building ‘settings.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.
Quitting from lines 26-41 (settings.Rmd) 
Error: processing vignette 'settings.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘settings.Rmd’

--- re-building ‘shiny.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.
--- finished re-building ‘shiny.Rmd’

--- re-building ‘talkcross.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.
--- finished re-building ‘talkcross.Rmd’

SUMMARY: processing the following files failed:
  ‘animate.Rmd’ ‘buttons.Rmd’ ‘cluster.Rmd’ ‘dynamic.Rmd’ ‘formats.Rmd’
  ‘get_started.Rmd’ ‘layout.Rmd’ ‘plugins.Rmd’ ‘settings.Rmd’

Error: Vignette re-building failed.
Execution halted