当我尝试在R studio中安装软件包时，它会返回以下错误：
Error in file("https://raw.githubusercontent.com/rbslandau/statistics_multi/master/Data/installed_pkgs.txt", :
cannot open the connection
In addition: Warning message:
In file("https://raw.githubusercontent.com/rbslandau/statistics_multi/master/Data/installed_pkgs.txt", :
InternetOpenUrl failed: 'đ´O'
Warning in install.packages :
unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/3.4:
cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/3.4/PACKAGES'
我已经尝试过以前问题的所有可能的解决方案，但它没有帮助。
有人可以帮我解决这个问题吗？