Error(s) in re-building vignettes:
  ...
--- re-building ‘case_fatality_rate.Rmd’ using rmarkdown
── Attaching packages ─────────────────────────────────────── tidyverse 1.3.0 ──
✔ ggplot2 3.3.0     ✔ purrr   0.3.4
✔ tibble  3.0.1     ✔ dplyr   0.8.5
✔ tidyr   1.1.0     ✔ stringr 1.4.0
✔ readr   1.3.1     ✔ forcats 0.5.0
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
Loading required package: viridisLite

Attaching package: 'scales'

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

    viridis_pal

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

    discard

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

    col_factor

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

--- re-building ‘case_study_global_trends.Rmd’ using rmarkdown
── Attaching packages ─────────────────────────────────────── tidyverse 1.3.0 ──
✔ ggplot2 3.3.0     ✔ purrr   0.3.4
✔ tibble  3.0.1     ✔ dplyr   0.8.5
✔ tidyr   1.1.0     ✔ stringr 1.4.0
✔ readr   1.3.1     ✔ forcats 0.5.0
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
Loading required package: viridisLite
Downloading data from: https://extranet.who.int/tme/generateCSV.asp?ds=estimates
Downloading the data using fread::data.table has failed. Trying
                again using utils::read.csv
Downloading the data using utils::read.csv has failed trying a 
                  direct download instead.
trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
Downloading data has failed after 1 tries.
Attempting data download in 2.2 seconds.
Downloading data from: https://extranet.who.int/tme/generateCSV.asp?ds=estimates
Downloading the data using utils::read.csv has failed trying a 
                  direct download instead.
trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
Downloading data has failed after 2 tries.
Attempting data download in 1.1 seconds.
Downloading data from: https://extranet.who.int/tme/generateCSV.asp?ds=estimates
Downloading the data using utils::read.csv has failed trying a 
                  direct download instead.
trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
Downloading data has failed after 3 tries.
Attempting data download in 0.7 seconds.
Quitting from lines 34-36 (case_study_global_trends.Rmd) 
Error: processing vignette 'case_study_global_trends.Rmd' failed with diagnostics:
Data downloading has failed, check your internet connection.
           If this issue is not resolved, contact the package author.
--- failed re-building ‘case_study_global_trends.Rmd’

--- re-building ‘intro.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

trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
trying URL ‘https://extranet.who.int/tme/generateCSV.asp?ds=estimates’
Quitting from lines 38-41 (intro.Rmd) 
Error: processing vignette 'intro.Rmd' failed with diagnostics:
Data downloading has failed, check your internet connection.
           If this issue is not resolved, contact the package author.
--- failed re-building ‘intro.Rmd’

SUMMARY: processing the following files failed:
  ‘case_study_global_trends.Rmd’ ‘intro.Rmd’

Error: Vignette re-building failed.
Execution halted