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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 muscat
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* checking for file ‘muscat/DESCRIPTION’ ... OK
* preparing ‘muscat’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘analysis.Rmd’ using rmarkdown
Quitting from lines 119-122 (analysis.Rmd) 
Error: processing vignette 'analysis.Rmd' failed with diagnostics:
error in evaluating the argument 'x' in selecting a method for function 'rowSums': unable to find an inherited method for function 'counts' for signature '"tbl_df"'
--- failed re-building ‘analysis.Rmd’

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

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

Error: Vignette re-building failed.
Execution halted