Hey there -
While others have mentioned that improper UVs can cause this, there is also a problem where importing meshes with overlapping loose parts causes the error if you have ‘Build Nanite’ enabled. This happens even if the objects is properly UVd. I suspect this is a bug and have reported it as such. I have confirmed for my models that disabling Nanite for the meshes causes the error to disappear.
The same mesh into UE 4.27 also does not produce any errors, so this is a problem with Nanite and meshes with overlapping loose parts.
If your object is properly UVd, disable ‘build nanite’ and import and see whether the error goes away. If it does, you may want to consider also submitting a bug report for this.