FBX import error because all of its polygons are degenarate

Hi there,

I am new toi UE and having an error importing my zbrush highpoly fbx model. I get this error “failed importing because all of its polygons are degenerate” and I can’t even understand what it means. I tried fix geometry in zbrush, import the model to blender and maya, reexport and still cannot fix this issue.