DataLossError: not an sstable (bad magic number)

[shiningdai]

First thank you very much for providing such a convenient tool .
I am tring to test the base example according to the README.md by run following scripts:
./my models/lenet5.yaml datasets/mnist.yaml system.checkpoint.load=pretrained eval

However, I got following error report:

Traceback (most recent call last):
  File "./my.py", line 13, in <module>
    cli.CLI().main()
  File "mayo/cli.py", line 300, in main
    commands[each]()
  File "mayo/cli.py", line 210, in cli_eval
    return self._get_session('validate').eval()
  File "/home/daisurong/workspace_2021/mayo/mayo/session/base.py", line 50, in wrapped
    return func(self, *args, **kwargs)
  File "/home/daisurong/workspace_2021/mayo/mayo/session/eval.py", line 19, in eval
    self.load_checkpoint(key)
  File "/home/daisurong/workspace_2021/mayo/mayo/session/base.py", line 50, in wrapped
    return func(self, *args, **kwargs)
  File "/home/daisurong/workspace_2021/mayo/mayo/session/base.py", line 224, in load_checkpoint
    restore_vars = self.checkpoint.load(name)
  File "/home/daisurong/workspace_2021/mayo/mayo/session/checkpoint.py", line 102, in load
    reader = tf.train.NewCheckpointReader(path)
  File "/home/daisurong/.local/lib/python3.6/site-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 636, in NewCheckpointReader
    return CheckpointReader(compat.as_bytes(filepattern))
  File "/home/daisurong/.local/lib/python3.6/site-packages/tensorflow/python/pywrap_tensorflow_internal.py", line 648, in __init__
    this = _pywrap_tensorflow_internal.new_CheckpointReader(filename)
DataLossError: not an sstable (bad magic number)

> /home/daisurong/.local/lib/python3.6/site-packages/tensorflow/python/pywrap_tensorflow_internal.py(648)__init__()
    647     def __init__(self, filename):
--> 648         this = _pywrap_tensorflow_internal.new_CheckpointReader(filename)
    649         try:

ipdb> i
*** NameError: name 'i' is not defined
ipdb> s  

Then, the program exited itself.
Could you please give me some tips on how to make it work correctly.
Thank you so much!