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--- re-building 'getstarted.Rmd' using rmarkdown

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 Downloaded 108 bytes...iconv: error while reading the input: Is a directory
Quitting from lines 176-181 (getstarted.Rmd) 
Error: processing vignette 'getstarted.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building 'getstarted.Rmd'

SUMMARY: processing the following file failed:
  'getstarted.Rmd'

Error: Vignette re-building failed.
Execution halted