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) and/or pandoc-citeproc 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 85-87 (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) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
Loading required package: Rcpp

********************************************************
Note: As of version 1.0.0, cowplot does not change the
  default ggplot2 theme anymore. To recover the previous
  behavior, execute:
  theme_set(theme_cowplot())
********************************************************


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) and/or pandoc-citeproc 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

Warning in y1 - y2 :
  longer object length is not a multiple of shorter object length
Warning in y1 - y2 :
  longer object length is not a multiple of shorter object length
--- finished re-building ‘flanker.Rmd’

--- re-building ‘stroop.Rmd’ using rmarkdown
Warning in engine$weave(file, quiet = quiet, encoding = enc) :
  Pandoc (>= 1.12.3) and/or pandoc-citeproc 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