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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 xcore
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* checking for file ‘xcore/DESCRIPTION’ ... OK
* preparing ‘xcore’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘xcore_vignette.Rmd’ using rmarkdown
Quitting from lines 121-127 (xcore_vignette.Rmd) 
Error: processing vignette 'xcore_vignette.Rmd' failed with diagnostics:
failed to load resource
  name: EH7301
  title: remap_promoters_f5
  reason: error in evaluating the argument 'x' in selecting a method for function 'get': error reading from connection
--- failed re-building ‘xcore_vignette.Rmd’

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

Error: Vignette re-building failed.
Execution halted