"Too many light styles on a same face"

Bad news... you'll have to ditch some of the switchable lights. Hit this for more info:
http://www.slackiller.com/tommy14/errors.htm#lightstyles

You dont need that many lights.. make it 2 instead of 6
and use tex-lights instead of point (cant be triggered tho

Ok, but what?s that of textured light? I heard that before but I don?t know what they are. Can you explain me?

this error is caused when 4 or more dynamic lights hit the same face. if you make some of them not switchable, or not flickery then it should be fine. I've had this error before, and sometimes it makes no difference whatsoever. you could also try splitting up your wall, but the joints are where this lighting error are found, as one will be light and the other face will be dark.

oh, and for texture lights, i think you run a lights.rad program, and then any textures of lights will emit lights. apperently it looks good but i haven't tried it yet

Its tons better than normal lighting.
Vlatitude has a good tutorial: Vlatitude: An Introduction to Lighting

Hard to judge what never was.