Error(s) in re-building vignettes:
  ...
--- re-building ‘cchic_overview.Rmd’ using rmarkdown
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in `[.data.table`(demogt, , `:=`("index", seq(nrow(demogt)))) :
  Invalid .internal.selfref detected and fixed by taking a (shallow) copy of the data.table so that := can add this new column by reference. At an earlier point, this data.table has been copied by R (or was created manually using structure() or similar). Avoid key<-, names<- and attr<- which in R currently (and oddly) may copy the whole data.table. Use set* syntax instead to avoid copying: ?set, ?setnames and ?setattr. If this message doesn't help, please report your use case to the data.table issue tracker so the root cause can be fixed or this message improved.
Warning: Removed 4 rows containing missing values (geom_vline).
Quitting from lines 95-96 (cchic_overview.Rmd) 
Error: processing vignette 'cchic_overview.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘cchic_overview.Rmd’

--- re-building ‘data_clean.Rmd’ using rmarkdown
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in .which.datatype(stname2code(names(demogt)[i]))(demogt[[i]]) :
  NAs introduced by coercion
Warning in `[.data.table`(demogt, , `:=`("index", seq(nrow(demogt)))) :
  Invalid .internal.selfref detected and fixed by taking a (shallow) copy of the data.table so that := can add this new column by reference. At an earlier point, this data.table has been copied by R (or was created manually using structure() or similar). Avoid key<-, names<- and attr<- which in R currently (and oddly) may copy the whole data.table. Use set* syntax instead to avoid copying: ?set, ?setnames and ?setattr. If this message doesn't help, please report your use case to the data.table issue tracker so the root cause can be fixed or this message improved.
Quitting from lines 54-69 (data_clean.Rmd) 
Error: processing vignette 'data_clean.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘data_clean.Rmd’

SUMMARY: processing the following files failed:
  ‘cchic_overview.Rmd’ ‘data_clean.Rmd’

Error: Vignette re-building failed.
Execution halted