Error(s) in re-building vignettes:
--- re-building ‘tf_idf.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Quitting from lines 13-17 (tf_idf.Rmd) 
Error: processing vignette 'tf_idf.Rmd' failed with diagnostics:
package or namespace load failed for 'ggplot2' in namespaceExport(ns, exports):
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--- failed re-building ‘tf_idf.Rmd’

--- re-building ‘tidying_casting.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.
Loading required package: NLP

Attaching package: 'NLP'

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

    annotate


Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

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    intersect, setdiff, setequal, union

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Quitting from lines 62-73 (tidying_casting.Rmd) 
Error: processing vignette 'tidying_casting.Rmd' failed with diagnostics:
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--- failed re-building ‘tidying_casting.Rmd’

--- re-building ‘tidytext.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) not available. Falling back to R Markdown v1.

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

Joining, by = "word"
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Quitting from lines 98-103 (tidytext.Rmd) 
Error: processing vignette 'tidytext.Rmd' failed with diagnostics:
polygon edge not found
--- failed re-building ‘tidytext.Rmd’

SUMMARY: processing the following files failed:
  ‘tf_idf.Rmd’ ‘tidying_casting.Rmd’ ‘tidytext.Rmd’

Error: Vignette re-building failed.
Execution halted