title: can't install xlsx package in R 3.2.1
body: <p>I am using Rstudio 3.2.1. And am unable to install the <code>xlsx</code> package. Following is what I did and received: </p>
  
  <pre><code>install.packages("xlsx")
  
  Warning in install.packages :
  
    unable to access index for repository /src/contrib
  
  Installing package into ‘C:/Users/shivanshu/Documents/R/win-library/3.2’
  
  (as ‘lib’ is unspecified)
  
  Warning in install.packages :
  
    unable to access index for repository /src/contrib
  
  Warning in install.packages :
  
    package ‘xlsx’ is not available (for R version 3.2.1)
  
  Warning in install.packages :
  
    unable to access index for repository /bin/windows/contrib/3.2
  </code></pre>
  
  <p>How can I fix this problem?</p>