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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 optimalFlow
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* checking for file ‘optimalFlow/DESCRIPTION’ ... OK
* preparing ‘optimalFlow’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘optimalFlow_vignette.Rmd’ using rmarkdown
2025-06-23 17:45:35.070 R[75362:25265270] XType: com.apple.fonts is not accessible.
2025-06-23 17:45:35.071 R[75362:25265270] XType: XTFontStaticRegistry is enabled.

Quitting from optimalFlow_vignette.Rmd:172-178 [ej52]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `socketConnection()`:
! cannot open the connection
---
Backtrace:
    ▆
 1. └─optimalFlow::optimalFlowTemplates(...)
 2.   └─parallel::makePSOCKcluster(n.cores, setup_strategy = "sequential")
 3.     └─parallel:::newPSOCKnode(names[[i]], options = options, rank = i)
 4.       └─base::socketConnection(...)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'optimalFlow_vignette.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘optimalFlow_vignette.Rmd’

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

Error: Vignette re-building failed.
Execution halted