Make sure your mesh does not contain any "Zero length vectors". Faces that have three vertexes and no area is an example of that. Try getting rid of those and everything should work!
This also applies for other 3D applications as well such as: 3Ds Max, Modo, Blender and so on.
Tags: SUITE, Edge Normals, Soft, Hard, Verts, Vertex, Zero Length Vector, Face