I am trying to do the Trailhead for Setting Up Wave Analytics and I can't get the Developer Org to activate Wave with my login. I have setup an account and I have clicked on the Setup link. This just gets stuck at 50% and doesn't move on.

Does anyone know why I am getting this error, when the process clearly exists and is active?

Challenge not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Process failed. First exception on row 0; first error: NO_APPLICABLE_PROCESS, No applicable approval process was found.