Error(s) in re-building vignettes:
  ...
--- re-building ‘FAQs.Rmd’ using rmarkdown
Loading required package: emmeans
--- finished re-building ‘FAQs.Rmd’

--- re-building ‘basics.Rmd’ using rmarkdown
--- finished re-building ‘basics.Rmd’

--- re-building ‘comparisons.Rmd’ using rmarkdown
--- finished re-building ‘comparisons.Rmd’

--- re-building ‘confidence-intervals.Rmd’ using rmarkdown
--- finished re-building ‘confidence-intervals.Rmd’

--- re-building ‘interactions.Rmd’ using rmarkdown
--- finished re-building ‘interactions.Rmd’

--- re-building ‘messy-data.Rmd’ using rmarkdown
Quitting from lines 55-57 (messy-data.Rmd) 
Error: processing vignette ‘messy-data.Rmd’ failed with diagnostics:
there is no package called 'car'
--- failed re-building ‘messy-data.Rmd’

--- re-building ‘models.Rmd’ using rmarkdown
--- finished re-building ‘models.Rmd’

--- re-building ‘predictions.Rmd’ using rmarkdown
Loading required package: lme4
Quitting from lines 82-87 (predictions.Rmd) 
Error: processing vignette ‘predictions.Rmd’ failed with diagnostics:
could not find function "lmer"
--- failed re-building ‘predictions.Rmd’

--- re-building ‘sophisticated.Rmd’ using rmarkdown
Quitting from lines 49-51 (sophisticated.Rmd) 
Error: processing vignette ‘sophisticated.Rmd’ failed with diagnostics:
there is no package called 'lme4'
--- failed re-building ‘sophisticated.Rmd’

--- re-building ‘transformations.Rmd’ using rmarkdown
NOTE: Results may be misleading due to involvement in interactions
NOTE: Results may be misleading due to involvement in interactions
NOTE: Results may be misleading due to involvement in interactions
NOTE: Results may be misleading due to involvement in interactions
Loading required package: lme4
Quitting from lines 588-596 (transformations.Rmd) 
Error: processing vignette ‘transformations.Rmd’ failed with diagnostics:
object ‘cbpp’ not found
--- failed re-building ‘transformations.Rmd’

--- re-building ‘utilities.Rmd’ using rmarkdown
--- finished re-building ‘utilities.Rmd’

--- re-building ‘vignette-topics.Rmd’ using rmarkdown
--- finished re-building ‘vignette-topics.Rmd’

--- re-building ‘xplanations.Rmd’ using rmarkdown
--- finished re-building ‘xplanations.Rmd’

--- re-building ‘xtending.Rmd’ using rmarkdown
Near-stationary-ridge situation detected -- stationary point altered
 Change 'threshold' if this is not what you intend
--- finished re-building ‘xtending.Rmd’

SUMMARY: processing the following files failed:
  ‘messy-data.Rmd’ ‘predictions.Rmd’ ‘sophisticated.Rmd’ ‘transformations.Rmd’

Error: Vignette re-building failed.
Execution halted