I noticed a problem when I try to use baked lights.
This is a screenshot with area lights and realtime directional light http://screencast.com/t/8L2umlUeW
And this happens when i change my ambient GI to baked and directional light to baked.
Thank you for your answer. Yes the problem was with the UV maps which were made in the 3D application.
After I fixed the UV maps, everything works fine.