Vuforia - World Center Mode - Camera missing,Vuforia - World Center mode - Camera missing

Hi!

I am trying to make a simple ar demo on my phone but the world center mode option CAMERA is missing. I only get the three other options. The program works when running it on Unity on my computer, but as soon as i run it on my phone, only the skybox shows up. What am I missing? :(,I am making a simple AR demo on my phone with Vuforia, where i have to set the world center mode to camera. The problem is that camera is missing. Only the other 3 options show. What am i missing? :(