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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 factR
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* checking for file ‘factR/DESCRIPTION’ ... OK
* preparing ‘factR’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘factR.Rmd’ using rmarkdown
trying URL 'ftp://ftp.ebi.ac.uk/pub/databases/gencode/Gencode_mouse/release_M25/gencode.vM25.annotation.gtf.gz'

Quitting from lines 196-200 [import.gencode] (factR.Rmd)
Error: processing vignette 'factR.Rmd' failed with diagnostics:
cannot open URL 'ftp://ftp.ebi.ac.uk/pub/databases/gencode/Gencode_mouse/release_M25/gencode.vM25.annotation.gtf.gz'
--- failed re-building ‘factR.Rmd’

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

Error: Vignette re-building failed.
Execution halted