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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 cellxgenedp
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* checking for file ‘cellxgenedp/DESCRIPTION’ ... OK
* preparing ‘cellxgenedp’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘using_cellxgenedp.Rmd’ using rmarkdown
objc[25147]: +[NSNumber initialize] may have been in progress in another thread when fork() was called.
objc[25147]: +[NSNumber initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
Quitting from lines 85-86 (using_cellxgenedp.Rmd) 
Error: processing vignette 'using_cellxgenedp.Rmd' failed with diagnostics:
Expected value at line 1 and column 2
--- failed re-building ‘using_cellxgenedp.Rmd’

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

Error: Vignette re-building failed.
Execution halted