Error(s) in re-building vignettes:
  ...
--- re-building ‘arrange_parliament_8.Rmd’ using knitr
Quitting from lines 44-61 (arrange_parliament_8.Rmd) 
Error: processing vignette 'arrange_parliament_8.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘arrange_parliament_8.Rmd’

--- re-building ‘basic-parliament-plots_1.Rmd’ using knitr
Quitting from lines 84-93 (basic-parliament-plots_1.Rmd) 
Error: processing vignette 'basic-parliament-plots_1.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘basic-parliament-plots_1.Rmd’

--- re-building ‘draw-majority-threshold_3.Rmd’ using knitr
Quitting from lines 46-67 (draw-majority-threshold_3.Rmd) 
Error: processing vignette 'draw-majority-threshold_3.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘draw-majority-threshold_3.Rmd’

--- re-building ‘emphasize_parliamentarians_6.Rmd’ using knitr
Quitting from lines 45-71 (emphasize_parliamentarians_6.Rmd) 
Error: processing vignette 'emphasize_parliamentarians_6.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘emphasize_parliamentarians_6.Rmd’

--- re-building ‘facet-parliament_5.Rmd’ using knitr
Quitting from lines 67-80 (facet-parliament_5.Rmd) 
Error: processing vignette 'facet-parliament_5.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘facet-parliament_5.Rmd’

--- re-building ‘hanging_seats_7.Rmd’ using knitr
Quitting from lines 49-93 (hanging_seats_7.Rmd) 
Error: processing vignette 'hanging_seats_7.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘hanging_seats_7.Rmd’

--- re-building ‘highlight-government_4.Rmd’ using knitr
Quitting from lines 62-72 (highlight-government_4.Rmd) 
Error: processing vignette 'highlight-government_4.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘highlight-government_4.Rmd’

--- re-building ‘label-parties_2.Rmd’ using knitr
Quitting from lines 63-84 (label-parties_2.Rmd) 
Error: processing vignette 'label-parties_2.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘label-parties_2.Rmd’

SUMMARY: processing the following files failed:
  ‘arrange_parliament_8.Rmd’ ‘basic-parliament-plots_1.Rmd’
  ‘draw-majority-threshold_3.Rmd’ ‘emphasize_parliamentarians_6.Rmd’
  ‘facet-parliament_5.Rmd’ ‘hanging_seats_7.Rmd’
  ‘highlight-government_4.Rmd’ ‘label-parties_2.Rmd’

Error: Vignette re-building failed.
Execution halted