Error(s) in re-building vignettes:
  ...
--- re-building ‘blackwhitefigures.Rmd’ using rmarkdown
Install package "strengejacke" from GitHub (`devtools::install_github("strengejacke/strengejacke")`) to load all sj-packages at once!
Quitting from lines 22-29 (blackwhitefigures.Rmd) 
Error: processing vignette 'blackwhitefigures.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘blackwhitefigures.Rmd’

--- re-building ‘custplot.Rmd’ using rmarkdown
Quitting from lines 28-55 (custplot.Rmd) 
Error: processing vignette 'custplot.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘custplot.Rmd’

--- re-building ‘plot_interactions.Rmd’ using rmarkdown
Learn more about sjPlot with 'browseVignettes("sjPlot")'.
Install package "strengejacke" from GitHub (`devtools::install_github("strengejacke/strengejacke")`) to load all sj-packages at once!
Quitting from lines 36-49 (plot_interactions.Rmd) 
Error: processing vignette 'plot_interactions.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_interactions.Rmd’

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

--- re-building ‘plot_model_estimates.Rmd’ using rmarkdown
Quitting from lines 59-60 (plot_model_estimates.Rmd) 
Error: processing vignette 'plot_model_estimates.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_model_estimates.Rmd’

--- re-building ‘sjtitemanalysis.Rmd’ using rmarkdown
Install package "strengejacke" from GitHub (`devtools::install_github("strengejacke/strengejacke")`) to load all sj-packages at once!

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

--- finished re-building ‘sjtitemanalysis.Rmd’

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

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

--- re-building ‘tab_model_estimates.Rmd’ using rmarkdown
Learn more about sjPlot with 'browseVignettes("sjPlot")'.
Classes and Methods for R developed in the
Political Science Computational Laboratory
Department of Political Science
Stanford University
Simon Jackman
hurdle and zeroinfl functions by Achim Zeileis
--- finished re-building ‘tab_model_estimates.Rmd’

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

SUMMARY: processing the following files failed:
  ‘blackwhitefigures.Rmd’ ‘custplot.Rmd’ ‘plot_interactions.Rmd’
  ‘plot_model_estimates.Rmd’

Error: Vignette re-building failed.
Execution halted