Problem with General GI. Directional lightmaps

hello, I have a problem with me IM general. I have a warning : Directional lightmaps cannot be decoded on SM2.0 hardware nor when using GLES2.0 .
I’ve read several article on the subject , and I can not too understand how to solve this problem. I am newbie in unity , and I do not speak English very well … someone could help me fix it.
This is my configuration :
2*GTX980TI
I7 5930K
16GO RAM

Thank lot!


I also encountered this problem, with the solution. Thank you