Error(s) in re-building vignettes:
duplicated vignette title:
  ‘Replicating Highcharts Demos’

--- re-building ‘charting-data-frames.Rmd’ using rmarkdown
Highcharts (www.highcharts.com) is a Highsoft software product which is
not free for commercial and Governmental use

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 ‘charting-data-frames.Rmd’

--- re-building ‘charting-maps.Rmd’ using rmarkdown
trying URL 'https://code.highcharts.com/mapdata/countries/nz/nz-all.js'
Content type 'application/x-javascript' length 36810 bytes (35 KB)
==================================================
downloaded 35 KB

trying URL 'https://code.highcharts.com/mapdata/custom/usa-and-canada.js'
Content type 'application/x-javascript' length 134466 bytes (131 KB)
==================================================
downloaded 131 KB

trying URL 'https://code.highcharts.com/mapdata/countries/us/us-ca-all.js'
Content type 'application/x-javascript' length 40824 bytes (39 KB)
==================================================
downloaded 39 KB

trying URL 'https://code.highcharts.com/mapdata/countries/us/us-all.js'
Content type 'application/x-javascript' length 66923 bytes (65 KB)
==================================================
downloaded 65 KB

trying URL 'https://code.highcharts.com/mapdata/countries/us/us-all.js'
Content type 'application/x-javascript' length 66923 bytes (65 KB)
==================================================
downloaded 65 KB

trying URL 'https://code.highcharts.com/mapdata/countries/fj/fj-all.js'
Content type 'application/x-javascript' length 20412 bytes (19 KB)
==================================================
downloaded 19 KB

trying URL 'https://code.highcharts.com/mapdata/custom/world.js'
Content type 'application/x-javascript' length 190328 bytes (185 KB)
==================================================
downloaded 185 KB

--- finished re-building ‘charting-maps.Rmd’

--- re-building ‘replicating-highcharts-demos.Rmd’ using rmarkdown
--- finished re-building ‘replicating-highcharts-demos.Rmd’

Error: Duplicate vignette titles.
  Ensure that the %\VignetteIndexEntry lines in the vignette sources
  correspond to the vignette titles.
Execution halted