Lighting Error Can't Fix

Hi everyone,

My project is create in 4.11 blueprint. First, I copy all assets to a new empty 4.12 C++ project. I copy all assets from 4.11 “Content” folder to C++ “Content” folder directly (not doing in Game Engine). Then, I open the level in 4.12 C++ project. After setting in Plugins and restart, the scene turn dark (see below).

I don’t know why so I try to add a sky light to the scene (see below).

Then, after Build.

It seem nothing chance, just bright little bit. I am setting the sky light’s intensity to 20. When I try other lights, they can’t work enough too.

Therefore, I try other method to copy file from 4.11 to 4.12 project. I right click on folders that I want to move in Unreal Engine and select “Migrate”.

However, I got this message.

I can’t find out why it happen and I just open the C++ project again but the problem of lighting still happen.

I change Blueprint to C++ because I want to package a VR mobile apps and play it with samsung Gear VR. Therefore, I need to set Plugins again for package project. After setting, the problem appear.

Would someone help me plz. Thank you so much.