i have already posted 3 qustions about same thing in answerhub , check them here :
https://answers.unrealengine.com/questions/821820/view.html
https://answers.unrealengine.com/questions/853859/view.html
https://answers.unrealengine.com/questions/821568/view.html
those has alot of info about my problem , it has been long time with this problem.
please if anyone can help me with this i will be so happy.
and thanks.