Error(s) in re-building vignettes:
  ...
--- re-building ‘learningtower_school.Rmd’ using rmarkdown
── Attaching packages ─────────────────────────────────────── tidyverse 1.3.1 ──
✔ ggplot2 3.3.5     ✔ purrr   0.3.4
✔ tibble  3.1.6     ✔ dplyr   1.0.7
✔ tidyr   1.1.4     ✔ stringr 1.4.0
✔ readr   2.1.0     ✔ forcats 0.5.1
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
The learningtower package provides data from OECD PISA database.
For size reasons only a small subset is provided in the package.
Use the function load_student() to access the full data.
Downloading year 2018...

trying URL ‘https://github.com/kevinwang09/learningtower/raw/master/student_full_data/student_2018.rds’
Content type 'application/octet-stream' length 10252712 bytes (9.8 MB)
==================================================
downloaded 9.8 MB

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

--- re-building ‘learningtower_student.Rmd’ using rmarkdown
── Attaching packages ─────────────────────────────────────── tidyverse 1.3.1 ──
✔ ggplot2 3.3.5     ✔ purrr   0.3.4
✔ tibble  3.1.6     ✔ dplyr   1.0.7
✔ tidyr   1.1.4     ✔ stringr 1.4.0
✔ readr   2.1.0     ✔ forcats 0.5.1
── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ dplyr::filter() masks stats::filter()
✖ dplyr::lag()    masks stats::lag()
The learningtower package provides data from OECD PISA database.
For size reasons only a small subset is provided in the package.
Use the function load_student() to access the full data.
Downloading year 2012...

trying URL ‘https://github.com/kevinwang09/learningtower/raw/master/student_full_data/student_2012.rds’
Warning in utils::download.file(url = url_git, destfile = tmp) :
  URL ‘https://raw.githubusercontent.com/kevinwang09/learningtower/master/student_full_data/student_2012.rds’: Timeout of 60 seconds was reached
Quitting from lines 102-146 (learningtower_student.Rmd) 
Error: processing vignette 'learningtower_student.Rmd' failed with diagnostics:
cannot open URL ‘https://github.com/kevinwang09/learningtower/raw/master/student_full_data/student_2012.rds’
--- failed re-building ‘learningtower_student.Rmd’

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

Error: Vignette re-building failed.
Execution halted