I rectify the problem already for Oppo R11 I need to go to setting, display& brightness and
Indra, deactivate the portrait and orientation lock(for Poweramp) for other device I do not need to deactivate.
Thanks for the reply. I just bought the paid version actually when I see Poweramp version 3 in Google Chrome news. Straight away download trial and bought the Unlocker. Really love this app. It's worth buying it.