我无法通过最新版本的RStudio and R Version.3.1.1.Kindly帮助安装软件包。我收到如下错误：
Example:
Warning in install.packages :
InternetOpenUrl failed: ''
Warning in install.packages :
InternetOpenUrl failed: ''
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.1
Installing package into ‘C:/Users/Documents/R/win-library/3.1’
(as ‘lib’ is unspecified)
Warning in install.packages :
InternetOpenUrl failed: ''
Warning in install.packages :
InternetOpenUrl failed: ''
Warning in install.packages :
unable to access index for repository http://cran.rstudio.com/bin/windows/contrib/3.1
Warning in install.packages :
package ‘reshape’ is not available (for R version 3.1.1)