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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 Moonlight2R
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* checking for file ‘Moonlight2R/DESCRIPTION’ ... OK
* preparing ‘Moonlight2R’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘Moonlight2R.Rmd’ using rmarkdown
trying URL 'https://egg2.wustl.edu/roadmap/data/byFileType/chromhmmSegmentations/ChmmModels/core_K27ac/jointModel/final/E096_18_core_K27ac_hg38lift_mnemonics.bed.gz'
Content type 'application/x-gzip' length 3835377 bytes (3.7 MB)
==================================================
downloaded 3.7 MB


Quitting from lines 761-766 [unnamed-chunk-21] (Moonlight2R.Rmd)
Error: processing vignette 'Moonlight2R.Rmd' failed with diagnostics:
ℹ In index: 1.
Caused by error in `if (count_pubmed > 0) ...`:
! argument is of length zero
--- failed re-building ‘Moonlight2R.Rmd’

SUMMARY: processing the following file failed:
  ‘Moonlight2R.Rmd’

Error: Vignette re-building failed.
Execution halted