Lens cover problem SE w700i

I own a Sony Ericsson w700i phone.When i go to camera i open the lens cover and it says "open lens cover" while it's open.What should I do?

Hello
i have this problem for k770 but i can't find the solution on the net.
now i find the solution.
maybe your phone opened or hit few days before u find this problem.
now the solution : open the back of the phone and u can see 2 pushing keyjust right the camrea.
when the cover was closed the near key was pushed down, and when u pushing down the camera cover. the keys going up.
the problem is, this key can't going up,
now u can buy a new mobile cover.
or loosening the screw.
or as i do with a knife, scratch on the little hole that's the key going there.
i'm sorry for bad writing english.but i thibk this solution may help u don't loos your time and money.
be happy