Error(s) in re-building vignettes:
  ...
--- re-building ‘advanced_topics.Rmd’ using rmarkdown

Quitting from lines 89-98 [unnamed-chunk-3] (advanced_topics.Rmd)
Error: processing vignette 'advanced_topics.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘advanced_topics.Rmd’

--- re-building ‘epi-SEIR.Rmd’ using rmarkdown

Quitting from lines 45-56 [unnamed-chunk-2] (epi-SEIR.Rmd)
Error: processing vignette 'epi-SEIR.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘epi-SEIR.Rmd’

--- re-building ‘epi-network.Rmd’ using rmarkdown

Quitting from lines 36-47 [unnamed-chunk-2] (epi-network.Rmd)
Error: processing vignette 'epi-network.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘epi-network.Rmd’

--- re-building ‘epi-node-Imperial-decoupled.Rmd’ using rmarkdown

Quitting from lines 36-45 [unnamed-chunk-2] (epi-node-Imperial-decoupled.Rmd)
Error: processing vignette 'epi-node-Imperial-decoupled.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘epi-node-Imperial-decoupled.Rmd’

--- re-building ‘epi-node-SIS-decoupled.Rmd’ using rmarkdown

Quitting from lines 38-47 [unnamed-chunk-2] (epi-node-SIS-decoupled.Rmd)
Error: processing vignette 'epi-node-SIS-decoupled.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘epi-node-SIS-decoupled.Rmd’

--- re-building ‘epi-node.Rmd’ using rmarkdown

Quitting from lines 37-46 [unnamed-chunk-2] (epi-node.Rmd)
Error: processing vignette 'epi-node.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘epi-node.Rmd’

--- re-building ‘inhomogeneous.Rmd’ using rmarkdown

Quitting from lines 42-50 [unnamed-chunk-2] (inhomogeneous.Rmd)
Error: processing vignette 'inhomogeneous.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘inhomogeneous.Rmd’

--- re-building ‘lifecycle-network.Rmd’ using rmarkdown

Quitting from lines 35-46 [unnamed-chunk-2] (lifecycle-network.Rmd)
Error: processing vignette 'lifecycle-network.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘lifecycle-network.Rmd’

--- re-building ‘lifecycle-node.Rmd’ using rmarkdown

Quitting from lines 43-52 [unnamed-chunk-2] (lifecycle-node.Rmd)
Error: processing vignette 'lifecycle-node.Rmd' failed with diagnostics:
there is no package called 'ggplot2'
--- failed re-building ‘lifecycle-node.Rmd’

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

Error: Vignette re-building failed.
Execution halted