To cite package ‘err’ in publications use:

  Thorley J, Dunham J (2024). _err: Customizable Object Sensitive
  Messages_. R package version 0.2.0.9000,
  <https://github.com/poissonconsulting/err>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {err: Customizable Object Sensitive Messages},
    author = {Joe Thorley and James Dunham},
    year = {2024},
    note = {R package version 0.2.0.9000},
    url = {https://github.com/poissonconsulting/err},
  }