Unable to start a duels mode run

[anon43486798]

Try the workaround for this other Demon Hunter issue:

@Kerfluffle-11372

• A bug where attempting to enter a practice match with the Demon Hunter after queuing for Ranked Classic will result in an error.
  • The current workaround is to queue for Standard/Wild/Classic, cancel the queue, and re-enter the practice match.

Note, the duel starting issue has been reported multiple times. Help by searching first before posting to reduce duplicate issue threads.