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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 UCSC.utils
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* checking for file ‘UCSC.utils/DESCRIPTION’ ... OK
* preparing ‘UCSC.utils’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘UCSC.utils.Rmd’ using rmarkdown

Quitting from lines 48-51 [list_UCSC_genomes] (UCSC.utils.Rmd)
Error: processing vignette 'UCSC.utils.Rmd' failed with diagnostics:
Timeout was reached: [api.genome.ucsc.edu] Resolving timed out after 10028 milliseconds
--- failed re-building ‘UCSC.utils.Rmd’

SUMMARY: processing the following file failed:
  ‘UCSC.utils.Rmd’

Error: Vignette re-building failed.
Execution halted