Error(s) in re-building vignettes:
--- re-building ‘Ex-01-Propensity-Score-Weights-Using-GBM.Rmd’ using rmarkdown
--- finished re-building ‘Ex-01-Propensity-Score-Weights-Using-GBM.Rmd’

--- re-building ‘Ex-02-Adjusting-For-Survey-Non-Response-Using-Weights.Rmd’ using rmarkdown
--- finished re-building ‘Ex-02-Adjusting-For-Survey-Non-Response-Using-Weights.Rmd’

--- re-building ‘Ex-03-Instructor-Level-Effects-With-Bayesian-Multilevel-Models.Rmd’ using rmarkdown
--- finished re-building ‘Ex-03-Instructor-Level-Effects-With-Bayesian-Multilevel-Models.Rmd’

--- re-building ‘Ex-04-Webscraping-Online-Data-Files.Rmd’ using rmarkdown
Could not fetch https://live.staticflickr.com/65535/52281215570_5f9cc90a12_o.png
HttpExceptionRequest Request {
  host                 = "live.staticflickr.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/65535/52281215570_5f9cc90a12_o.png"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (ConnectionFailure Network.Socket.getAddrInfo (called with preferred socket type/protocol: AddrInfo {addrFlags = [AI_ADDRCONFIG], addrFamily = AF_UNSPEC, addrSocketType = Stream, addrProtocol = 0, addrAddress = <assumed to be undefined>, addrCanonName = <assumed to be undefined>}, host name: Just "live.staticflickr.com", service name: Just "443"): does not exist (Name or service not known))
Error: processing vignette 'Ex-04-Webscraping-Online-Data-Files.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘Ex-04-Webscraping-Online-Data-Files.Rmd’

--- re-building ‘Ex-05-Geocoding-Addresses.Rmd’ using rmarkdown
--- finished re-building ‘Ex-05-Geocoding-Addresses.Rmd’

SUMMARY: processing the following file failed:
  ‘Ex-04-Webscraping-Online-Data-Files.Rmd’

Error: Vignette re-building failed.
Execution halted