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###
### Running command:
###
###   /home/biocbuild/R/R/bin/R CMD build --keep-empty-dirs --no-resave-data BindingSiteFinder
###
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* checking for file ‘BindingSiteFinder/DESCRIPTION’ ... OK
* preparing ‘BindingSiteFinder’:
* checking DESCRIPTION meta-information ... OK
* installing the package to build vignettes
* creating vignettes ... ERROR
--- re-building ‘vignette.Rmd’ using rmarkdown
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH
Warning in hook_png(..., cmd = "optipng") :
  cannot find optipng; please install and put it in PATH

Quitting from vignette.Rmd:363-365 [unnamed-chunk-28]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `+.gg`:
! 'ggmatrix' does not know how to add objects that do not have class 'theme', 'labels' or 'ggproto'. Received object with class: 'character'
---
Backtrace:
    ▆
 1. └─BindingSiteFinder::reproducibilityScatterPlot(bdsOut)
 2.   └─GGally:::`+.gg`(...)
 3.     └─GGally:::add_list_to_ggmatrix(e1, e2)
 4.       └─GGally:::`+.gg`(e1, item)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'vignette.Rmd' failed with diagnostics:
'ggmatrix' does not know how to add objects that do not have class 'theme', 'labels' or 'ggproto'. Received object with class: 'character'
--- failed re-building ‘vignette.Rmd’

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

Error: Vignette re-building failed.
Execution halted