title: how to solve RDotNet REngine nullreference exception
body: <p>I am trying to use the <code>REngine.GetInstance()</code> function but I keep getting a null reference exception.</p>
  
  <p>I have tried using another function in REngine just in case the <code>getInstance</code> method was at fault, like <code>REngine.SetEnvironmentVariables()</code>, yet they all return the null reference exception.</p>
  
  <p>I have tried reinstalling the package. I have tried checking the installation path but I couldn't find how the rdotnetlibrary accesses it. I am not even sure the path is related to the problem.</p>
  
  <p>Please help.</p>