ArgumentNullException: Value cannot be null [FBX Exporter]

I’ve tried exporting a prefab as a Binary FBX and even tried as an ASCII FBX but I kepe getting this error.
I’ve tried on multiple versions of Unity, new packages and all, and to no avail. This error prevents the prefab from being exported. Help me, please!

6124805–667568–ERROR.txt (7.66 KB)

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I had the same problem. I had to manually check each child element of the prefab I want to export. I found there are Mesh Filters with NULL values assigned. I manually removed Mesh Filter components from the Inspector panel and re-exported the prefab to fbx. It worked.

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