Fatal Error

Personal ligthmapping’m doing my scene and the end of it I get an error described below.
Can anyone help me?

Interestingly, I’ve done some ligthmapping for selection and work out, but I’m trying to make the rest of the project and always gives this error. Have colequei but 4GB of Ram on my machine and the error persists.

Things to do in this case?

It’s second post for this error for like 2-3 days.
Your game/application requires more memory space but cant recieve it from system. Change resolution of your textures, lightmaps, meshes etc.