How to fix nearly zero bi-normals (Tolerance of 1E-4)?

Development Pipeline & Plugins
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Hello, guys! Thanks for trying to help me :slight_smile:

Everytime I import this mesh into UE4, I have this message (Nearly zero bi-normals (Tolerance of 1E-4))

I exported it from blender 2.8. FBX file. UVs are good.

I don’t know what’s problem, could you help me please?

288032-vraadjqrnigx.png
288032-vraadjqrnigx.png1010×609 45.9 KB

Here’s my UVs:

288033-ok1ya4mhkf1e.jpg
288033-ok1ya4mhkf1e.jpg1920×1017 275 KB