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FBX export error
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System Information
Operating system: Windows 10 last upadte
Graphics card: RTX 2060 last studio drivers

Blender Version
Broken: 2.93
(example: 2.79b release)
(example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
when exporting fpb, error message apears
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
very simple mesh...just newbie is trying{F10164780}

Event Timeline

It looks like something is wrong with the UVs on the building model. Judging by the error it emits...

...some of the UV vertices are probably positioned at NaN coordinates. UV unwrapping the model makes the export work correctly.

Not sure if these broken UVs are something that the exporter should handle.

Dear Fen, thanks alot for your info. Honestly I can do UV unwrapping, I have just strted with blender few hours seem like I have to do the model again...

If you'd like help with that, you can find me on . That'll be a better place for help with specific problems.

This is quite long standing issue, on one hand exporter could perhaps handle this better, but this shouldn't happen in the first place.
@Toman Kubik (tomankubik) if you can provide exact steps to reproduce such case, this would be very helpful. If you do, please do this in T79775