I have a file that I imported into Blender to create a basic animation to test with, then I export it to a FBX. When I import into UE4 I get a 'Could Not Find Needed track (master).
[File I import into Blender][1]
[1]: https://db.tt/nPRYqpZx
[Blender File][2]
[2]: https://db.tt/4DMw9Qkk
[UE4 Import File][3]
[3]: https://db.tt/1KM7Gxz1