exporting inference graph value error

• What is the top-level directory of the model you are using: research/object_detection
• Have I written custom code (as opposed to using a stock example script provided in TensorFlow): No
• OS Platform and Distribution (e.g., Linux Ubuntu 16.04):
• TensorFlow installed from (source or binary): google colab
• TensorFlow version (use command below): 1.15.0-rc3
• Bazel version (if compiling from source):
• CUDA/cuDNN version:
• GPU model and memory:google colab
• Exact command to reproduce: !python export_inference_graph.py --input_type=image_tensor --pipeline_config_path=training/ssd_mobilenet_v2_coco.config --trained_checkpoint_prefix=training/model.ckpt-1001 --output_directory=output

I am facing the issue with exporting graph using tensorflow object detection API running the command above.

Traceback (most recent call last):
  File "export_inference_graph.py", line 162, in <module>
    tf.app.run()
  File "/usr/local/lib/python3.6/dist-packages/tensorflow_core/python/platform/app.py", line 40, in run
    _run(main=main, argv=argv, flags_parser=_parse_flags_tolerate_undef)
  File "/usr/local/lib/python3.6/dist-packages/absl/app.py", line 299, in run
    _run_main(main, args)
  File "/usr/local/lib/python3.6/dist-packages/absl/app.py", line 250, in _run_main
    sys.exit(main(argv))
  File "export_inference_graph.py", line 158, in main
    write_inference_graph=FLAGS.write_inference_graph)
  File "/content/drive/My Drive/OD/models-master/research/object_detection/exporter.py", line 489, in export_inference_graph
    write_inference_graph=write_inference_graph)
  File "/content/drive/My Drive/OD/models-master/research/object_detection/exporter.py", line 418, in _export_inference_graph
    trained_checkpoint_prefix=checkpoint_to_use)
  File "/content/drive/My Drive/OD/models-master/research/object_detection/exporter.py", line 327, in write_graph_and_checkpoint
    saver.restore(sess, trained_checkpoint_prefix)
  File "/usr/local/lib/python3.6/dist-packages/tensorflow_core/python/training/saver.py", line 1282, in restore
    checkpoint_prefix)
ValueError: The passed save_path is not a valid checkpoint: training/model.ckpt-1001

I am having this issue although having model.ckpt-1001 in the folder.