When I make a terrain and try to make lighting this happen's

How large is your landscape and what did you set the landscape lightmap resolution to? Also how many GB’s of RAM do you have in your system?

zoomed in for memory

You cant expect much help with answers like that. How much RAM is a lot? There was a time 640 KB ram was a lot for people so i cant guess what yours is. And you havent answered the other questions on Lightmass importance volume and landscape lightmap resolution.

If you have an importance volume already then it is probably your ram not being enough. So you need to increase your virtual ram.

  • do you have a lightmass importance volume in your level?

my landscape is the defaut width and legnth and I have a lot of RAM

fixed it.

What was the solution? ^^

I made a smaller terrain…