i have solved rhe problem ..when i set my home wallpaper live video then my gallery video dont open .. I've delete my wallpaper and set a normal wallpaper. now its working properly without any errors. ..thank you gyz for your help ...

you mean vlc player which pay videos?if that so whats wrong with mx player?it also play that same videos that samsung video don't play.樂

please tell me if you know

why ??

what should I do