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

Quitting from lines 91-92 [Finding cbf modules] (fcoex.Rmd)
Error: processing vignette 'fcoex.Rmd' failed with diagnostics:
cannot xtfrm data frames
--- failed re-building ‘fcoex.Rmd’

--- re-building ‘fcoex_and_seurat.Rmd’ using rmarkdown

Quitting from lines 29-42 [Running Seurat pipeline] (fcoex_and_seurat.Rmd)
Error: processing vignette 'fcoex_and_seurat.Rmd' failed with diagnostics:
cannot xtfrm data frames
--- failed re-building ‘fcoex_and_seurat.Rmd’

SUMMARY: processing the following files failed:
  ‘fcoex.Rmd’ ‘fcoex_and_seurat.Rmd’

Error: Vignette re-building failed.
Execution halted