Error(s) in re-building vignettes:
  ...
--- re-building ‘annual-maps.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Some values in the specified facet_geo column 'BUYER_STATE' do not
  match the 'code' column of the specified grid and will be removed:
  AE, GU, MP, PR, PW, VI
--- finished re-building ‘annual-maps.Rmd’

--- re-building ‘county-analysis.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Joining, by = c("year", "countyfips")
--- finished re-building ‘county-analysis.Rmd’

--- re-building ‘individual-drug-mapping.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
`summarise()` ungrouping output (override with `.groups` argument)
`summarise()` regrouping output by 'BUYER_DEA_NO' (override with `.groups` argument)
Joining, by = "BUYER_DEA_NO"
Joining, by = "BUYER_DEA_NO"
Joining, by = c("BUYER_DEA_NO", "BUYER_STATE", "BUYER_COUNTY")
Joining, by = "BUYER_DEA_NO"
Warning in validateCoords(lng, lat, funcName) :
  Data contains 1 rows with either missing or invalid lat/lon values and will be ignored
Quitting from lines 122-212 (individual-drug-mapping.Rmd) 
Error: processing vignette 'individual-drug-mapping.Rmd' failed with diagnostics:
there is no package called 'webshot'
--- failed re-building ‘individual-drug-mapping.Rmd’

--- re-building ‘per-capita-pharmacies.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
--- finished re-building ‘per-capita-pharmacies.Rmd’

--- re-building ‘suspicious-order-detection.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning: Ignoring unknown parameters: opacity
Warning: Ignoring unknown aesthetics: fill
Warning: Removed 1 row(s) containing missing values (geom_path).
Warning: Ignoring unknown parameters: opacity
Warning: Ignoring unknown aesthetics: fill
Warning: Removed 11 row(s) containing missing values (geom_path).
--- finished re-building ‘suspicious-order-detection.Rmd’

SUMMARY: processing the following file failed:
  ‘individual-drug-mapping.Rmd’

Error: Vignette re-building failed.
Execution halted