¨Problems Importing an animation to my Skeleton Mesh (The animation sequence is not showing)

I’ve already done it months ago, but now it doesn’t work.
I never had this problem until now

I tried to search a solution in YT and Forums from UE4 and Blender (How to import animations into UE4/How to export skeletons from blender, etc. etc.
But i cant get a solution

What im doing wrong?