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

Quitting from BubbleTree-vignette.Rmd:125-206 [unnamed-chunk-7]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! c("assignment of an object of class \"ggplot2::ggplot\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot2::gg\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"S7_object\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", 
"assignment of an object of class \"gg\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE")
---
Backtrace:
    ▆
 1. └─methods::new("BTreePlotter", max.ploidy = 5, max.size = 10)
 2.   ├─methods::initialize(value, ...)
 3.   └─BubbleTree (local) initialize(value, ...)
 4.     └─BubbleTree (local) .local(.Object, ...)
 5.       └─methods (local) `<fn>`(`<chr>`, "branches", `<chr>`)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'BubbleTree-vignette.Rmd' failed with diagnostics:
c("assignment of an object of class \"ggplot2::ggplot\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot2::gg\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"S7_object\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE", 
"assignment of an object of class \"gg\" is not valid for @'branches' in an object of class \"BTreePlotter\"; is(value, \"gg\") is not TRUE")
--- failed re-building ‘BubbleTree-vignette.Rmd’

SUMMARY: processing the following file failed:
  ‘BubbleTree-vignette.Rmd’

Error: Vignette re-building failed.
Execution halted