I want to install the package impactr from github. Following the guideline stated by the package developer (https://rdrr.io/github/kamclean/impactr/f/vignettes/vignette_2_extract.Rmd), I repeatedly get the following error.
devtools::install_github("kamclean/impactr")
my_dois <- c("10.1111/j.1365-2486.2008.01617.x","10.1007/s10533-011-9655-2")
out_doi <- impactr::extract_doi(doi = my_dois, get_impact = TRUE)
Error: 'extract_doi' is not an exported object from 'namespace:impactr'
What is the problem? Any help is highly appreciated!