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--- re-building ‘ggplotify.Rmd’ using rmarkdown

Attaching package: 'cowplot'

The following object is masked from 'package:ggplot2':

    ggsave


Attaching package: 'ggimage'

The following object is masked from 'package:cowplot':

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Quitting from lines 119-141 (ggplotify.Rmd) 
Error: processing vignette 'ggplotify.Rmd' failed with diagnostics:
VECTOR_ELT() can only be applied to a 'list', not a 'double'
--- failed re-building ‘ggplotify.Rmd’

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

Error: Vignette re-building failed.
Execution halted