Unknown Material Type error?

I'm modeling a 3 stringer short span timber bridge in staad. The model consists of the three beams and deck planks (which are modeled as Plates). All geometry, material properties, supporting, and loading have been assigned. There is only one error in the Output File, regarding the Materials. Seeing as how the materials are taken from the staad database, I don't see how this is occuring? Please review output file and provide advice. Thank you!

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