Running ObjectDetectorWriter.create_for_inference received KeyError: 701

Model I use: ssd_mobilenet_v2_fpnlite_320x320_coco17_tpu-8

Running

writer = ObjectDetectorWriter.create_for_inference( writer_utils.load_file(_MODEL_PATH), [127.5], [127.5], [_LABEL_FILE])writer_utils.save_file(writer.populate(), _SAVE_TO_PATH),
received following error

KeyError                                  Traceback (most recent call last)
[<ipython-input-60-0a9a5c3c8853>](https://localhost:8080/#) in <module>()
      9 
     10 writer = ObjectDetectorWriter.create_for_inference(
---> 11     writer_utils.load_file(_MODEL_PATH), [127.5], [127.5], [_LABEL_FILE])
     12 writer_utils.save_file(writer.populate(), _SAVE_TO_PATH)
     13 

2 frames
[/usr/local/lib/python3.7/dist-packages/tensorflow_lite_support/metadata/python/metadata_writers/object_detector.py](https://localhost:8080/#) in <listcomp>(.0)
    210 
    211     # Output metadata according to output_tensor_indices.
--> 212     output_metadata = [indices_to_tensors[i] for i in output_tensor_indices]
    213 
    214     # Create subgraph info.

KeyError: 701