Error occur on session start - "Invaild asset reference "

[RyuFuru12121]

Hi,

Let me question about the title.
I imported a 3D model purchased in a third-party site into UEFN and placed the 3D asset on the level. And then click “Start Session”, this session fails to start with the following error:
・[AssetLog] /IJNA_Airplane_Museum/D4Y/mtl_001 (← my asset path) : InVaild Asset Reference /Interchange/Functions/MF_PhongToMetalRoughness. 。(AssetValidator_AssetReferenceRestrictions)
・[AssetLog] /IJNA_Airplane_Museum/D4Y/mtl_001 (← my asset path): InVaild Asset Reference /Interchange/Functions/MF_PhongToMetalRoughness. 。(FortValidator_IllegalReferences)

I research these errors but cannot find the cause and its solution.
Please give me some advice if you know the same or similar problem.

Regards,

[Hardcawcanary]

I’m not really sure, but having metalroughness, could it be using a material that is now invalid because of the new material functions restrictions ?