使用object_detection 的demo时，使用yolov3的onnx模型，通过x2paddl转为paddle模型后，使用opt工具生成.nb模型，结果报错：

[F 6/30 15: 1:43.385 ...evelop/lite/model_parser/model_parser.cc:794 LoadModelNaiveFromFile] Paddle-Lite v2.7 has upgraded the naive-buffer model format. Please use the OPT to generate a new model. Thanks!
./run.sh: line 19: 16931 Aborted (core dumped) LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${PADDLE_LITE_DIR}/libs/${TARGET_ARCH_ABI} ./object_detection_demo ../models/ssd_mobilenet_v1_pascalvoc_for_cpu/model.nb ../labels/pascalvoc_label_list ../images/dog.jpg ./result.jpg