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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 gDRcore
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* checking for file ‘gDRcore/DESCRIPTION’ ... OK
* preparing ‘gDRcore’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘gDR-annotation.Rmd’ using rmarkdown
--- finished re-building ‘gDR-annotation.Rmd’

--- re-building ‘gDR-data-model.Rmd’ using rmarkdown
--- finished re-building ‘gDR-data-model.Rmd’

--- re-building ‘gDRcore.Rmd’ using rmarkdown

Quitting from lines 76-86 [unnamed-chunk-3] (gDRcore.Rmd)
Error: processing vignette 'gDRcore.Rmd' failed with diagnostics:
object 'ReferenceDivisionTime' not found
--- failed re-building ‘gDRcore.Rmd’

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

Error: Vignette re-building failed.
Execution halted