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--- re-building ‘using-crossva-and-openva.Rmd’ using rmarkdown
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Overall acceptance ratio
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Quitting from lines 172-184 (using-crossva-and-openva.Rmd) 
Error: processing vignette 'using-crossva-and-openva.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘using-crossva-and-openva.Rmd’

SUMMARY: processing the following file failed:
  ‘using-crossva-and-openva.Rmd’

Error: Vignette re-building failed.
Execution halted