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### Running command:
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###   /home/biocbuild/bbs-3.21-bioc/R/bin/R CMD build --keep-empty-dirs --no-resave-data NanoporeRNASeq
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* checking for file ‘NanoporeRNASeq/DESCRIPTION’ ... OK
* preparing ‘NanoporeRNASeq’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘NanoporeRNASeq.Rmd’ using rmarkdown

Quitting from NanoporeRNASeq.Rmd:58-71 [unnamed-chunk-2]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `validObject()`:
! invalid class "GGbio" object: invalid object for slot "ggplot" in class "GGbio": got class "ggplot2::ggplot", should be or extend class "gg_OR_NULL"
---
Backtrace:
     ▆
  1. ├─ggplot2::autoplot(range, aes(col = strand), group.selfish = TRUE)
  2. └─ggbio::autoplot(range, aes(col = strand), group.selfish = TRUE)
  3.   └─ggbio (local) .local(object, ...)
  4.     ├─BiocGenerics::do.call(ggplot, c(list(data = object), list(aes.res)))
  5.     ├─base::do.call(ggplot, c(list(data = object), list(aes.res)))
  6.     ├─ggplot2 (local) `<fn>`(data = `<GRanges>`, `<ggplt2::>`)
  7.     └─ggbio:::ggplot.Vector(data = `<GRanges>`, `<ggplt2::>`)
  8.       └─ggbio::GGbio(gg, data = data)
  9.         ├─BiocGenerics::do.call(...)
 10.         ├─base::do.call(...)
 11.         └─methods (local) `<fn>`(...)
 12.           ├─methods::initialize(value, ...)
 13.           └─methods::initialize(value, ...)
 14.             └─methods::validObject(.Object)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'NanoporeRNASeq.Rmd' failed with diagnostics:
invalid class "GGbio" object: invalid object for slot "ggplot" in class "GGbio": got class "ggplot2::ggplot", should be or extend class "gg_OR_NULL"
--- failed re-building ‘NanoporeRNASeq.Rmd’

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

Error: Vignette re-building failed.
Execution halted