title: Error when installing: cannot coerce type 'closure' to vector of type 'character'
body: <p>Tried to install all rattle related packages by typing:</p>
  
  <pre><code>install.packages(rattle, dependencies = c("Depends","Suggests"))
  </code></pre>
  
  <p>and got this</p>
  
  <pre><code>Installing package into ‘C:/Users/Hooman/Documents/R/win-library/3.1’
  (as ‘lib’ is unspecified)
  Error in as.character(x) : 
    cannot coerce type 'closure' to vector of type 'character'
  </code></pre>
  
  <p>I already installed two individual packages in that folder and had no issue.</p>