ShaderForge materials are black on Android Cardboard Build

I have seen this posted before, and I've tried some of the other solutions I've found before but nothing has worked so far. Basically, the materials work in the editor, but when I make the APK build and open it on the phone, all the materials are black. Please advise on this, if you could. I don't know if there's a setting I'm missing or what have you, but any help would be appreciated