SkeletalMesh Animation showing in Mantinee but disappear in PIE

Hi! I am having this issues for a few days now, after countless of time looking for solutions on internet I cant find the answer so I decide to post it here.
I have a very simple skeletal mesh animation that I import into mantinee , everything is playing perfectly fine within Mantinee, but when I use movie export ( mantinee ) or play in PIE , the skeletal mesh is not showing at all . Any one experienced this before or having any available solutions/ suggestion ?
I am using 4.10
( the problem was worse in 4.9 tho )