Skeletal Mesh Tree Invisible!!

good afternoon. anyone knows why the selected mesh on the top left are invisible ingame and in editor for me? it was working fne, i was even not working on the character blueprint and from nowhere this is hapenning. anyone knows what may have happened?

i have set another skeletal mesh on the character and it displayed. the current arms on the character are the new skeletal tree i have add. the old one i deleted.

i can pick a weapon in game but now its missing too.