Error(s) in re-building vignettes:
  ...
--- re-building ‘adaptation_level.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: Rcpp

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

Quitting from lines 84-86 (adaptation_level.Rmd) 
Error: processing vignette 'adaptation_level.Rmd' failed with diagnostics:
result would be too long a vector
--- failed re-building ‘adaptation_level.Rmd’

--- re-building ‘afterimages.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: Rcpp

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

--- finished re-building ‘afterimages.Rmd’

--- re-building ‘flanker.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: Rcpp

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

--- finished re-building ‘flanker.Rmd’

--- re-building ‘stroop.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: Rcpp
Scale for 'fill' is already present. Adding another scale for 'fill', which will replace the existing scale.
--- finished re-building ‘stroop.Rmd’

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

Error: Vignette re-building failed.
Execution halted