Import Mesh Error: Bi Normals Are Nearly Zero, Tolerance of 1E-4

Having trouble importing FBX/USD of a castle. When I tried USD the materials did not appear on the mesh even though material was rigged fine.

When trying to import the FBX I keep getting this nearly zero error. “Remove Degenerates” is checked and the entire entry is sort of greyed out. I can’t un-check the box.