Need help getting the Google Tango Experimental Augmented Reality Example working

So I am starting out to do some projects in Tango using Unity. I cloned the examples from their github (https://github.com/googlesamples/tango-examples-unity) and tried running their Experimental Augmented Reality example. So I figured out how to attach the scripts to their respective game modules.

However, everytime I try to run the program, in the ARScreen.cs script this line

m_textures = m_tangoApplication.GetVideoOverlayTextureYUV();

always returns null. So I combed through google's documentation to see what causes it to return null but I could not find anything on it. Is there anyone that successfully ran the Experimental Augmented Reality example that can shed some light on this? I am using unity 5 and using 4.4.2 on the Tango tablet.