When Chosing the skeleton it keeps turning to NONE

everything is fine with all of my other characters, just this one guy that i can import with no issues,looks good and everything is alright,BUT when i import other animations (Of the same skeleton) and chose his skeleton the choice turns back to none,if i chose any other skeleton the choice is set,only this skeleton.
Also in my player blue print if i switch the skeletal mesh to the new guy it turns to none aswell.
Tried all the export import things i could find on google,same issue.