title: Error: attempt to use zero-length variable name
body: <p>Without opening any files, I get the following error when opening Rstudio:</p>
  
  <blockquote>
    <p>"Error: attempt to use zero-length variable name"</p>
  </blockquote>
  
  <p>All my commands are ignored (i.e. nothing happens, no warnings and R becomes unresponsive to anything I do) and I have tried rm and gc options to no availability and also updated to the latest version of Rstudio and R but I still get this error. </p>
  
  <p>I am running windows 7 (64bit).</p>