Scene appears white on other devices.

Hello, I'm currently working on a game for android and I've run into a problem when opening my committed scene on another computer or devices.

When the scene is opened on my friends computer, all the textures are missing and when viewing the scene on a tablet or phone, the screen is completly white.

Our only theory is that it's something going wrong when I commit the scene to the project server, but we're not sure.

Any ideas?