Ok, I´ve solved it. i´ll leave it here for anyone who need it. I´ve created a new empty map, and I´ve checked out that in that map, the Message of rebuilding the lights does appear. So, I saved that new map, and I did open the “corrupted” map. Witch ctrl+A, and ctrl+V, I´ve selected all the objects in that map, and pasted them with ctrl+V to my new map. I´ve rebuilt the light (It wasn´t working in the corrupted map) and it worked as always. I hope this helps someone.