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

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Quitting from lines 146-165 (getstarted.Rmd) 
Error: processing vignette 'getstarted.Rmd' failed with diagnostics:
'names' attribute [60] must be the same length as the vector [2]
--- failed re-building 'getstarted.Rmd'

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

Error: Vignette re-building failed.
Execution halted