Error(s) in re-building vignettes:
--- re-building ‘count_data_and_overdispersion.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 25-54 (count_data_and_overdispersion.Rmd) 
Error: processing vignette 'count_data_and_overdispersion.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘count_data_and_overdispersion.Rmd’

--- re-building ‘dealing_with_right_skewed_data.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 26-68 (dealing_with_right_skewed_data.Rmd) 
Error: processing vignette 'dealing_with_right_skewed_data.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘dealing_with_right_skewed_data.Rmd’

--- re-building ‘exploring_links_for_the_gaussian_distribution.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 50-52 (exploring_links_for_the_gaussian_distribution.Rmd) 
Error: processing vignette 'exploring_links_for_the_gaussian_distribution.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘exploring_links_for_the_gaussian_distribution.Rmd’

--- re-building ‘introduction.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 29-38 (introduction.Rmd) 
Error: processing vignette 'introduction.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘introduction.Rmd’

--- re-building ‘stepwise_search.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 32-60 (stepwise_search.Rmd) 
Error: processing vignette 'stepwise_search.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘stepwise_search.Rmd’

--- re-building ‘tweedie_distribution.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 34-43 (tweedie_distribution.Rmd) 
Error: processing vignette 'tweedie_distribution.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘tweedie_distribution.Rmd’

SUMMARY: processing the following files failed:
  ‘count_data_and_overdispersion.Rmd’
  ‘dealing_with_right_skewed_data.Rmd’
  ‘exploring_links_for_the_gaussian_distribution.Rmd’
  ‘introduction.Rmd’ ‘stepwise_search.Rmd’ ‘tweedie_distribution.Rmd’

Error: Vignette re-building failed.
Execution halted