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

--- re-building ‘core_dreme.Rmd’ using rmarkdown
--- finished re-building ‘core_dreme.Rmd’

--- re-building ‘core_fimo.Rmd’ using rmarkdown
--- finished re-building ‘core_fimo.Rmd’

--- re-building ‘core_tomtom.Rmd’ using rmarkdown
--- finished re-building ‘core_tomtom.Rmd’

--- re-building ‘install_guide.Rmd’ using rmarkdown
--- finished re-building ‘install_guide.Rmd’

--- re-building ‘integrative_analysis.Rmd’ using rmarkdown
--- finished re-building ‘integrative_analysis.Rmd’

--- re-building ‘tidy_motifs.Rmd’ using rmarkdown
Quitting from lines 41-43 (tidy_motifs.Rmd) 
Error: processing vignette 'tidy_motifs.Rmd' failed with diagnostics:
there is no package called 'MotifDb'
--- failed re-building ‘tidy_motifs.Rmd’

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

Error: Vignette re-building failed.
Execution halted