Error(s) in re-building vignettes:
--- re-building 'Brief-Overview.Rmd' using rmarkdown
--- finished re-building 'Brief-Overview.Rmd'

--- re-building 'Example1.Rmd' using rmarkdown
Could not fetch https://www4.stat.ncsu.edu/~boos/Monte.Carlo.se/table9_1.jpg
HttpExceptionRequest Request {
  host                 = "www4.stat.ncsu.edu"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/~boos/Monte.Carlo.se/table9_1.jpg"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'Example1.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'Example1.Rmd'

--- re-building 'Example2.Rmd' using rmarkdown
Could not fetch https://www4.stat.ncsu.edu/~boos/Monte.Carlo.se/table_11_4.jpg
HttpExceptionRequest Request {
  host                 = "www4.stat.ncsu.edu"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/~boos/Monte.Carlo.se/table_11_4.jpg"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'Example2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'Example2.Rmd'

--- re-building 'Example3.Rmd' using rmarkdown
Could not fetch https://www4.stat.ncsu.edu/~boos/Monte.Carlo.se/table_11_4.jpg
HttpExceptionRequest Request {
  host                 = "www4.stat.ncsu.edu"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/~boos/Monte.Carlo.se/table_11_4.jpg"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'Example3.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'Example3.Rmd'

SUMMARY: processing the following files failed:
  'Example1.Rmd' 'Example2.Rmd' 'Example3.Rmd'

Error: Vignette re-building failed.
Execution halted