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This is a regression in the OpenStudio SDK starting at 3.5.1, I've opened an issue at https://github.com/NREL/OpenStudio/issues/4994

In the meantime, you can just grab the content of the OSM if you want. If you paste this in your model (.osm) it should work just fine.

OS:Material,
  {3d35de05-e7a6-41e8-9e58-fd0d752e0899}, !- Handle
  Brick - Fired Clay - 4 in. - 130 lb/ft3, !- Name
  MediumRough,                            !- Roughness
  0.1016,                                 !- Thickness {m}
  1.02,                                   !- Conductivity {W/m-K}
  2082.40023861482,                       !- Density {kg/m3}
  790;                                    !- Specific Heat {J/kg-K}

This is a regression in the OpenStudio SDK starting at 3.5.1, I've opened an issue at https://github.com/NREL/OpenStudio/issues/4994

In the meantime, you can just grab the content of the OSM if you want. If you paste this in your model (.osm) it should work just fine.fine, or just recreate the material in the OSapp by hand.

$ cat ~/BCL/69decf20-7926-0130-b7f7-0026b9d40ccf/69e055c0-7926-0130-b7f9-0026b9d40ccf/files/Brick_Fired_Clay_4_in_130_lb_ft3.osm

OS:Material,
  {3d35de05-e7a6-41e8-9e58-fd0d752e0899}, !- Handle
  Brick - Fired Clay - 4 in. - 130 lb/ft3, !- Name
  MediumRough,                            !- Roughness
  0.1016,                                 !- Thickness {m}
  1.02,                                   !- Conductivity {W/m-K}
  2082.40023861482,                       !- Density {kg/m3}
  790;                                    !- Specific Heat {J/kg-K}