Error in re-building vignettes:
  ...
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning: call dbDisconnect() when finished working with a connection
Warning in value :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_20/gid_2018_03_20_tbamlb_balmlb_1/inning/inning_all.xml)
Warning in if (!isNamespace(ns)) stop("not a namespace") else if (!base.OK &&  :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_24/gid_2018_03_24_houmlb_bosmlb_1/inning/inning_all.xml)
Warning in isNamespace(ns) :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_24/gid_2018_03_24_sfnmlb_srcaaa_1/inning/inning_all.xml)
Warning in length(xi) :
  closing unused connection 6 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_26/gid_2018_03_26_chamlb_chraaa_1/inning/inning_all.xml)
Warning in length(xi) :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_26/gid_2018_03_26_balmlb_noraaa_1/inning/inning_all.xml)
Warning: closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_26/gid_2018_03_26_kcamlb_omaaaa_1/inning/inning_all.xml)
Warning in x$doc :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_26/gid_2018_03_26_sdnmlb_elpaaa_1/inning/inning_all.xml)
Warning in .Call(`_xml2_read_connection_`, con, chunk_size) :
  closing unused connection 5 (http://gd2.mlb.com/components/game/mlb/year_2018/month_03/day_27/gid_2018_03_27_cinmlb_texmlb_1/inning/inning_all.xml)
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Quitting from lines 87-98 (pitch_plotting.Rmd) 
Error: processing vignette 'pitch_plotting.Rmd' failed with diagnostics:
there is no package called 'webshot'
Execution halted