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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 flowCore
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* checking for file ‘flowCore/DESCRIPTION’ ... OK
* preparing ‘flowCore’:
* checking DESCRIPTION meta-information ... OK
* cleaning src
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘HowTo-flowCore.Rnw’ using knitr

Quitting from HowTo-flowCore.Rnw:1195-1197 [plotALL-openCyto]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `which()`:
! argument to 'which' is not logical
---
Backtrace:
    x
 1. +-ggplot2::autoplot(gs[[1]])
 2. \-ggcyto:::autoplot.GatingHierarchy(gs[[1]])
 3.   \-flowWorkspace:::.mergeGates(object, gate, bool, merge, projections = projections)
 4.     \-base::which(boolInd)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'HowTo-flowCore.Rnw' failed with diagnostics:
argument to 'which' is not logical
--- failed re-building ‘HowTo-flowCore.Rnw’

SUMMARY: processing the following file failed:
  ‘HowTo-flowCore.Rnw’

Error: Vignette re-building failed.
Execution halted