How can I fix this

I made model and this happend, idk why that happend, there should be a texture and my fbx model has that texture on that position.
Please help me, Thank you.

Try checking your normals. It you are using blender then it has a nice “Recalculate normals outside” function.

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In blender recalculating normals of a selection of verts goes with Ctrl+N

Well thank you, but I have no problem with blender, in blender it looks perfect, this only happend in ue4 and ue5

Can you confirm that in Blender the normals point outward like this?:

Because blender shows a surface (darkened) instead of transparent (UE) on the backside of a surface.

Does this help?