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

Quitting from CEMiTool.Rmd:43-45 [unnamed-chunk-2]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error:
! c("assignment of an object of class \"ggplot2::ggplot\" is not valid for @'mean_var_plot' in an object of class \"CEMiTool\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot\" is not valid for @'mean_var_plot' in an object of class \"CEMiTool\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"ggplot2::gg\" is not valid for @'mean_var_plot' in an object of class \"CEMiTool\"; is(value, \"gg\") is not TRUE", "assignment of an object of class \"S7_object\" is not valid for @'mean_var_plot' in an object of class \"CEMiTool\"; is(value, \"gg\") is not TRUE", 
"assignment of an object of class \"gg\" is not valid for @'mean_var_plot' in an object of class \"CEMiTool\"; is(value, \"gg\") is not TRUE")
---
Backtrace:
    ▆
 1. └─CEMiTool::cemitool(expr0)
 2.   ├─CEMiTool::plot_mean_var(results)
 3.   └─CEMiTool::plot_mean_var(results)
 4.     └─CEMiTool (local) .local(cem, ...)
 5.       └─methods (local) `<fn>`(`<chr>`, "mean_var_plot", `<chr>`)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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

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

Error: Vignette re-building failed.
Execution halted