title: Can't use R language with Beaker Notebook "Error: R language backend failed!"
body: <p>I can't figure out how to configure my setting to get <code>R</code> to work in <code>Beaker</code>? I tried both with the experimental <code>beaker-notebook-1.5.3-0-gb1553d1-electron-mac.dmg</code> version because I really don't want to use the browser for my programming.  I also tried the normal <code>beaker-notebook-1.5.2-0-g34d512f-mac.dmg</code> but got the same issue when running <code>R</code>.</p>
  <h1>Checked where my R is located</h1>
  <pre><code>$ which R
  /usr/bin/R
  </code></pre>
  <h1>Checked which version of R i'm using</h1>
  <pre><code>$ R
  
  R version 3.1.2 (2014-10-31) -- &quot;Pumpkin Helmet&quot;
  Copyright (C) 2014 The R Foundation for Statistical Computing
  Platform: x86_64-apple-darwin13.4.0 (64-bit)
  </code></pre>
  <h1>My preferences .json file</h1>
  <pre><code>#~/.beaker/v1/config/beaker.pref.json
  {
    &quot;languages&quot; : {
      &quot;IPython&quot; : {
        &quot;path&quot; : &quot;/Users/Mu/anaconda/bin&quot;
      },
      &quot;Python3&quot; : {
        &quot;path&quot; : &quot;/Users/Mu/anaconda/envs/python3/bin&quot;
      }
      &quot;R&quot; : {
        &quot;path&quot; : &quot;/usr/bin&quot;
      }
    },
    &quot;pref-format&quot; : &quot;1&quot;,
    &quot;advanced-mode&quot; : false,
    &quot;allow-anonymous-usage-tracking&quot; : true
  }
  </code></pre>
  <p><a href="https://i.stack.imgur.com/BCKX5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BCKX5.png" alt="enter image description here" /></a></p>
  <p><code>IPython</code> is working fine...</p>
  <p><a href="https://i.stack.imgur.com/DZDfb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DZDfb.png" alt="enter image description here" /></a></p>