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.
--- finished 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.
--- finished 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.
--- finished 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.
--- finished 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.
--- finished 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 35-46 (lifecycle-network.Rmd) 
Error: processing vignette 'lifecycle-network.Rmd' failed with diagnostics:
there is no package called 'MGDrivE'
--- 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 43-52 (lifecycle-node.Rmd) 
Error: processing vignette 'lifecycle-node.Rmd' failed with diagnostics:
there is no package called 'MGDrivE'
--- 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.
Quitting from lines 38-47 (output-storage.Rmd) 
Error: processing vignette 'output-storage.Rmd' failed with diagnostics:
there is no package called 'MGDrivE'
--- failed re-building ‘output-storage.Rmd’

SUMMARY: processing the following files failed:
  ‘lifecycle-network.Rmd’ ‘lifecycle-node.Rmd’ ‘output-storage.Rmd’

Error: Vignette re-building failed.
Execution halted