Я пытался установить пакет xlsx в R studio, но он возвращает какую-то ошибку.Не могу определить, в чем проблема.Пожалуйста, помогите. Вот журнал ошибок
Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib: cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES' Installing package into ‘C:/Users/lenovo/Documents/R/win-library/3.5’ (as ‘lib’ is unspecified) Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib: cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES' Warning in install.packages : package ‘xlsx’ is not available (for R version 3.5.1) Warning in install.packages : unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.5: cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/PACKAGES'