Error(s) in re-building vignettes:
  ...
--- re-building ‘basics.Rmd’ using knitr
Loading required package: ggplot2
Quitting from lines 24-25 (basics.Rmd) 
Error: processing vignette 'basics.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘basics.Rmd’

--- re-building ‘plot_dist.Rmd’ using knitr
Loading required package: ggplot2
Quitting from lines 20-22 (plot_dist.Rmd) 
Error: processing vignette 'plot_dist.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_dist.Rmd’

--- re-building ‘plot_lm.Rmd’ using knitr
--- finished re-building ‘plot_lm.Rmd’

--- re-building ‘plot_map.Rmd’ using knitr
Loading required package: maps
Quitting from lines 18-26 (plot_map.Rmd) 
Error: processing vignette 'plot_map.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_map.Rmd’

--- re-building ‘plot_pca.Rmd’ using knitr
Loading required package: ggplot2
Quitting from lines 18-21 (plot_pca.Rmd) 
Error: processing vignette 'plot_pca.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_pca.Rmd’

--- re-building ‘plot_surv.Rmd’ using knitr
Loading required package: ggplot2
Quitting from lines 18-22 (plot_surv.Rmd) 
Error: processing vignette 'plot_surv.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_surv.Rmd’

--- re-building ‘plot_ts.Rmd’ using knitr
Loading required package: ggplot2
Quitting from lines 18-20 (plot_ts.Rmd) 
Error: processing vignette 'plot_ts.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘plot_ts.Rmd’

SUMMARY: processing the following files failed:
  ‘basics.Rmd’ ‘plot_dist.Rmd’ ‘plot_map.Rmd’ ‘plot_pca.Rmd’
  ‘plot_surv.Rmd’ ‘plot_ts.Rmd’

Error: Vignette re-building failed.
Execution halted