FGBuildable Lightweight

Most of my FGBuildable are Lightweight. But I couldn't figure out which AccessTransformer to use to access the BuildingMeshProxy, so I added a FGColoredInstanceMeshProxy, and it works fine. Except it generates warning and error lines in debug mode. How can I fix this? CreateExport: /GatewaysExtension/Catwalks/Catwalk_Ramp_1M_Middle/Build_Catwalk_Ramp_1M_Middle (0xD13F5E551FDB9461) /GatewaysExtension/Catwalks/Catwalk_Ramp_1M_Middle/Build_Catwalk_Ramp_1M_Middle (0xD13F5E551FDB9461) - Could not find template object for BuildingMeshProxy