无法安装RStudio和R Version.3.1.1最新版本中的软件包

Question

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/3.1Installing 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/3.1Warning in install.packages :  package ‘reshape’ is not available (for R version 3.1.1)