Blender weird shading I'm having this problem 

If you notice que is this weird shading on the curve , how can I fix it? i dont really know what it is, I've already tried flipping the normals but nothing, what else can i try?
thanks!
P.S. the mesh was imported from unreal, because in unreal it shows this problem
Fixed it, if you are importing from blender to unreal, and get the degenerate tangent base problem ujst uncheck this 

the first two options
P.S. sorry, my unreal engine is in spanish