Error(s) in re-building vignettes:
  ...
--- re-building ‘differencepredictemmeans.Rmd’ using rmarkdown
Loading required namespace: emmeans
Loading required namespace: ggplot2
Quitting from lines 55-56 (differencepredictemmeans.Rmd) 
Error: processing vignette 'differencepredictemmeans.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘differencepredictemmeans.Rmd’

--- re-building ‘effectsatvalues.Rmd’ using rmarkdown
Quitting from lines 42-50 (effectsatvalues.Rmd) 
Error: processing vignette 'effectsatvalues.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘effectsatvalues.Rmd’

--- re-building ‘marginaleffects.Rmd’ using rmarkdown
Quitting from lines 56-61 (marginaleffects.Rmd) 
Error: processing vignette 'marginaleffects.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘marginaleffects.Rmd’

--- re-building ‘plotcustomize.Rmd’ using rmarkdown
Quitting from lines 24-38 (plotcustomize.Rmd) 
Error: processing vignette 'plotcustomize.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plotcustomize.Rmd’

--- re-building ‘plotmethod.Rmd’ using rmarkdown
Loading required namespace: ggplot2
Quitting from lines 26-48 (plotmethod.Rmd) 
Error: processing vignette 'plotmethod.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plotmethod.Rmd’

--- re-building ‘randomeffects.Rmd’ using rmarkdown
Loading required package: Matrix
Loading required namespace: ggplot2
Quitting from lines 24-32 (randomeffects.Rmd) 
Error: processing vignette 'randomeffects.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘randomeffects.Rmd’

--- re-building ‘stata.Rmd’ using rmarkdown
Loading required namespace: ggplot2
Quitting from lines 62-64 (stata.Rmd) 
Error: processing vignette 'stata.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘stata.Rmd’

SUMMARY: processing the following files failed:
  ‘differencepredictemmeans.Rmd’ ‘effectsatvalues.Rmd’
  ‘marginaleffects.Rmd’ ‘plotcustomize.Rmd’ ‘plotmethod.Rmd’
  ‘randomeffects.Rmd’ ‘stata.Rmd’

Error: Vignette re-building failed.
Execution halted