title: Transferring unroll memory to storage memory failed
body: <p>I am getting this java.lang.AssertionError with spark. The error does not really explain what is causing this error ( at least to me).
  Any help regarding what is causing this error and steps to fix this would be helpful.</p>
  
  <p><a href="https://i.stack.imgur.com/gcrZb.png" rel="noreferrer"><img src="https://i.stack.imgur.com/gcrZb.png" alt="enter image description here"></a></p>