Cubase 8 no meters nor audio output on OSX El Capitan


I have installed Cubase 8 on MacBook Pro (Retina, 13-inch, Early 2015) with OS X El Capitan (10.11.3 ).

I’m also using the NI Komplete Audio 6 audio interface.

My problem is, when I select the Komplete audio 6 in the Device Setup, there is no output. Not just that no audio is coming out, the meters aren’t showing as well. I have also checked the VST Connections configuration and it looks fine.

When selecting the computer’s Built-in audio the meters work and I do have audio!

Any idea what is going on?

I should also note that the NI komplete audio 6 is recognised by the the computer since it works fine on non-cubase audio such as iTunes and Soundcloud (it have been known that El Capitan failed to recognise this audio interface but this does not seem to be the problem)

I would appreciate any help, thanks,