Error(s) in re-building vignettes:
--- re-building 'glyph.Rmd' using rmarkdown

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 147-153 (glyph.Rmd) 
Error: processing vignette 'glyph.Rmd' failed with diagnostics:
there is no package called 'png'
--- failed re-building 'glyph.Rmd'

--- re-building 'highDim.Rmd' using rmarkdown
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
--- finished re-building 'highDim.Rmd'

--- re-building 'histogram-density-.Rmd' using rmarkdown
Warning: Computation failed in `stat_count_()`:
Elements must equal the number of rows or 1
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
Warning: Groups with fewer than two data points have been dropped.
Warning: Groups with fewer than two data points have been dropped.
Warning in max(ids, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
Warning in max(ids, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
Warning: Groups with fewer than two data points have been dropped.
Warning: Groups with fewer than two data points have been dropped.
Warning in max(ids, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
Warning in max(ids, na.rm = TRUE) :
  no non-missing arguments to max; returning -Inf
`summarise()` has grouped output by 'x'. You can override using the `.groups` argument.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
`stat_bin()` using `bins = 30`. Pick better value with `binwidth`.
--- finished re-building 'histogram-density-.Rmd'

SUMMARY: processing the following file failed:
  'glyph.Rmd'

Error: Vignette re-building failed.
Execution halted