title: Server returned error on SASL authentication step: Authentication failed. Parse to mLab migration
body: <p>I'm working on migrating my parse app to mLab but when I put my connection URL <code>mongodb://&lt;dbuser&gt;:&lt;dbpassword&gt;@ds159747.mlab.com:59747/appname</code> in the parse migration tool it gives me this error: </p>
  
  <pre><code>Server returned error on SASL authentication step: Authentication failed. 
  </code></pre>
  
  <p>What am I doing wrong?</p>