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### Running command:
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###   /home/biocbuild/bbs-3.22-bioc/R/bin/R CMD build --keep-empty-dirs --no-resave-data --md5 Maaslin2
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* checking for file ‘Maaslin2/DESCRIPTION’ ... OK
* preparing ‘Maaslin2’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘maaslin2.Rmd’ using rmarkdown

Quitting from maaslin2.Rmd:183-195 [unnamed-chunk-2]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! <ggplot2::labels> object is invalid:
- every label must be named.
---
Backtrace:
    ▆
 1. └─Maaslin2::Maaslin2(...)
 2.   └─Maaslin2:::maaslin2_association_plots(...)
 3.     └─ggplot2::labs("")
 4.       └─ggplot2::class_labels(args)
 5.         └─S7::new_object(labels)
 6.           └─S7::validate(object, recursive = !parent_validated)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'maaslin2.Rmd' failed with diagnostics:
<ggplot2::labels> object is invalid:
- every label must be named.
--- failed re-building ‘maaslin2.Rmd’

SUMMARY: processing the following file failed:
  ‘maaslin2.Rmd’

Error: Vignette re-building failed.
Execution halted