Omniverse Create Material Loading issue

Hi all,

So I’m getting the following message in the console:

2023-06-19 12:42:36 [Error] [omni.hydra] Failed to create MDL shade node for prim ‘/World/Looks/Ceramic_Tiles_Subway_Antique_White_Dirty_02/Shader’. Unsupported identifiers.

This happened all of a sudden, out of the blue. Materials were loading fine, and the next second, not. I also tried to export the MDL and re-apply the exported MDL but it seems that there are issues with exporting the MDL too.

Is there a fix for this issue please?

Thanks in advance!