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### Running command:
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###   /Library/Frameworks/R.framework/Resources/bin/R CMD build --keep-empty-dirs --no-resave-data RTCGA
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* checking for file ‘RTCGA/DESCRIPTION’ ... OK
* preparing ‘RTCGA’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘RTCGA_Workflow.Rmd’ using rmarkdown
Could not fetch https://raw.githubusercontent.com/RTCGA/RTCGA/master/RTCGA_workflow.png
HttpExceptionRequest Request {
  host                 = "raw.githubusercontent.com"
  port                 = 443
  secure               = True
  requestHeaders       = []
  path                 = "/RTCGA/RTCGA/master/RTCGA_workflow.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 = 6, addrAddress = <assumed to be undefined>, addrCanonName = <assumed to be undefined>}, host name: Just "raw.githubusercontent.com", service name: Just "443"): does not exist (nodename nor servname provided, or not known))
Error: processing vignette 'RTCGA_Workflow.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building ‘RTCGA_Workflow.Rmd’

SUMMARY: processing the following file failed:
  ‘RTCGA_Workflow.Rmd’

Error: Vignette re-building failed.
Execution halted