GF_SG_INVALID_PROTO 906 src/scenegraph/vrml_proto.c return GF_SG_INVALID_PROTO; GF_SG_INVALID_PROTO 997 src/scenegraph/vrml_proto.c return GF_SG_INVALID_PROTO; GF_SG_INVALID_PROTO 534 src/utils/error.c case GF_SG_INVALID_PROTO: