Unreal Engine or Blender FBX issue?

OK, I’m getting this error when trying to import a fbx file into Unreal Engine. Is this a blender fbx export issue or a unreal issue. I don’t see any settings I should be enabling in the fbx exporter.

" No smoothing group information was found in this FBX scene. Please make sure to enable the “Export Smoothing Groups” option in the FBX Exporter plug-in before exporting the file. "


Sorta found my answer here. https://answers.unrealengine.com/questions/116748/import-tree-failing.html
not sure why ,but if left on normals it gives the error, if switched to faces it doesn’t.