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

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

Quitting from lines 17-25 [setup] (conditions.Rmd)
Error: processing vignette 'conditions.Rmd' failed with diagnostics:
there is no package called 'gganimate'
--- failed re-building ‘conditions.Rmd’

--- re-building ‘example-dance.Rmd’ using rmarkdown

Quitting from lines 20-28 [setup] (example-dance.Rmd)
Error: processing vignette 'example-dance.Rmd' failed with diagnostics:
there is no package called 'gganimate'
--- failed re-building ‘example-dance.Rmd’

--- re-building ‘example-durante.Rmd’ using rmarkdown

Quitting from lines 27-35 [setup] (example-durante.Rmd)
Error: processing vignette 'example-durante.Rmd' failed with diagnostics:
there is no package called 'gganimate'
--- failed re-building ‘example-durante.Rmd’

--- re-building ‘example-frequentist.Rmd’ using rmarkdown

Quitting from lines 21-28 [setup] (example-frequentist.Rmd)
Error: processing vignette 'example-frequentist.Rmd' failed with diagnostics:
there is no package called 'gganimate'
--- failed re-building ‘example-frequentist.Rmd’

--- re-building ‘example-hurricane.Rmd’ using rmarkdown
--- finished re-building ‘example-hurricane.Rmd’

--- re-building ‘execution-multiverse.Rmd’ using rmarkdown
--- finished re-building ‘execution-multiverse.Rmd’

--- re-building ‘multiverse-in-rmd.Rmd’ using rmarkdown
--- finished re-building ‘multiverse-in-rmd.Rmd’

--- re-building ‘visualising-multiverse.Rmd’ using rmarkdown

Quitting from lines 22-31 [setup] (visualising-multiverse.Rmd)
Error: processing vignette 'visualising-multiverse.Rmd' failed with diagnostics:
there is no package called 'gganimate'
--- failed re-building ‘visualising-multiverse.Rmd’

SUMMARY: processing the following files failed:
  ‘conditions.Rmd’ ‘example-dance.Rmd’ ‘example-durante.Rmd’
  ‘example-frequentist.Rmd’ ‘visualising-multiverse.Rmd’

Error: Vignette re-building failed.
Execution halted