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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 weitrix
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* checking for file ‘weitrix/DESCRIPTION’ ... OK
* preparing ‘weitrix’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘V1_overview.Rmd’ using rmarkdown
--- finished re-building ‘V1_overview.Rmd’

--- re-building ‘V2_tail_length.Rmd’ using rmarkdown

Quitting from lines 42-60 [load] (V2_tail_length.Rmd)
Error: processing vignette 'V2_tail_length.Rmd' failed with diagnostics:
error in evaluating the argument 'x' in selecting a method for function 'as.matrix': bad value
--- failed re-building ‘V2_tail_length.Rmd’

--- re-building ‘V3_shift.Rmd’ using rmarkdown

Quitting from lines 56-77 [load] (V3_shift.Rmd)
Error: processing vignette 'V3_shift.Rmd' failed with diagnostics:
bad value
--- failed re-building ‘V3_shift.Rmd’

--- re-building ‘V4_airway.Rmd’ using rmarkdown
--- finished re-building ‘V4_airway.Rmd’

--- re-building ‘V5_slam_seq.Rmd’ using rmarkdown

Quitting from lines 42-69 [load] (V5_slam_seq.Rmd)
Error: processing vignette 'V5_slam_seq.Rmd' failed with diagnostics:
error in evaluating the argument 'x' in selecting a method for function 'as.matrix': bad value
--- failed re-building ‘V5_slam_seq.Rmd’

SUMMARY: processing the following files failed:
  ‘V2_tail_length.Rmd’ ‘V3_shift.Rmd’ ‘V5_slam_seq.Rmd’

Error: Vignette re-building failed.
Execution halted