Error(s) in re-building vignettes:
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--- re-building ‘getstarted.Rmd’ using rmarkdown

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 Downloaded 108 bytes...Quitting from lines 176-181 (getstarted.Rmd) 
Error: processing vignette 'getstarted.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘getstarted.Rmd’

Warning in for (i in seq_along(specs)) { :
  closing unused connection 4 (/home/hornik/tmp/scratch/Rtmp4H3F9i/file3ad9517419f2)
SUMMARY: processing the following file failed:
  ‘getstarted.Rmd’

Error: Vignette re-building failed.
Execution halted