vuEngineStart crashing in Native Magic Leap Application

Hello,

so I'm using VS to develop a native app for the magic leap device,

I've successfully reached all the steps before the vuEngineStart function:

init vuforia, creating the engine, creating the device and the image observer... I'm getting the prompt to allow permission to use the camera and I accept it, the license is also ok.

but when I'm reaching to start the Engine via vuEngineStart call, I'm getting a fatal error, with the message: " Received on_device_unavailable ".

I also can't find any resources for native development for Lumin, so are we supposed to follow the same sample as the Android one ? 

Thank you for your help !