Everything in my scene turns black when I switch to skybox lighting, how do I fix this?

I’m using unity 5.3, the game looks fine when I use color lighting but when I switch to a skybox (which I’ve created using the procedural generate option built within unity 5) everything in my scene turns black.

here’s a picture of what my scene looks like when I do the switch.
Also my project was created as 2D but I switched it to 3D by going into the editor settings, I felt like that might’ve been the problem but it didn’t do anything.

Auto light building has been disabled. Just for clarification, have you tried building the lighting since changing to a skybox?