为什么我在尝试安装“log4r”包时收到以下错误?
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/src/contrib:
cannot open URL 'http://cran.rstudio.com/src/contrib/PACKAGES'
Warning in install.packages :
package ‘log4r’ is not available for this version of R
我什至尝试更换 cran mirror 但一段时间后我遇到如下错误:
Warning message:
In download.file(url, destfile = f, quiet = TRUE) :
URL 'https://cran.r-project.org/CRAN_mirrors.csv': status was 'SSL connect error'
我尝试了以下解决方案:
我还能做什么?