Error(s) in re-building vignettes:
--- re-building ‘advanced_topics.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 221-232 (advanced_topics.Rmd) 
Error: processing vignette 'advanced_topics.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘advanced_topics.Rmd’

--- re-building ‘epi-SEIR.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 188-207 (epi-SEIR.Rmd) 
Error: processing vignette 'epi-SEIR.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epi-SEIR.Rmd’

--- re-building ‘epi-network.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 212-234 (epi-network.Rmd) 
Error: processing vignette 'epi-network.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epi-network.Rmd’

--- re-building ‘epi-node.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 171-191 (epi-node.Rmd) 
Error: processing vignette 'epi-node.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘epi-node.Rmd’

--- re-building ‘inhomogeneous.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 79-89 (inhomogeneous.Rmd) 
Error: processing vignette 'inhomogeneous.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘inhomogeneous.Rmd’

--- re-building ‘lifecycle-network.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 176-195 (lifecycle-network.Rmd) 
Error: processing vignette 'lifecycle-network.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘lifecycle-network.Rmd’

--- re-building ‘lifecycle-node.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 193-209 (lifecycle-node.Rmd) 
Error: processing vignette 'lifecycle-node.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘lifecycle-node.Rmd’

--- re-building ‘output-storage.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
--- finished re-building ‘output-storage.Rmd’

SUMMARY: processing the following files failed:
  ‘advanced_topics.Rmd’ ‘epi-SEIR.Rmd’ ‘epi-network.Rmd’ ‘epi-node.Rmd’
  ‘inhomogeneous.Rmd’ ‘lifecycle-network.Rmd’ ‘lifecycle-node.Rmd’

Error: Vignette re-building failed.
Execution halted