There is error arised form “data_utils.py”

[Lcococi]

--When I run：
python3 train_mdn.py

--There is error arised form “data_utils.py”:

         else:
                  ds_maxes = ds.map(lambda x: tf.reduce_max(x), num_parallel_calls=AUTOTUNE)
                  ds_mins = ds.map(lambda x: tf.reduce_min(x), num_parallel_calls=AUTOTUNE)
                  ds_min = ds_mins.reduce(tf.float32.max, lambda x, y: tf.math.minimum(x, y))               <--The error from this line
                  ds_max = ds_maxes.reduce(tf.float32.min, lambda x, y: tf.math.maximum(x, y))
                  ds_min, ds_max = ds_mins.numpy(), ds_maxes.numpy()

--The terminal shows:

     _File "/home/py/anaconda3/envs/torch/lib/python3.9/site-packages/tensorflow/python/framework/ops.py", line 7215, in 
     raise_from_not_ok_status
     raise core._status_to_exception(e) from None  # pylint: disable=protected-access
     tensorflow.python.framework.errors_impl.InvalidArgumentError: {{function_node 
     __wrapped__ReduceDataset_Targuments_0_Tstate_1_output_types_1_device_/job:localhost/replica:0/task:0/device:CPU:0}} Key: 
     inputs.  Can't parse serialized Example.
     [[{{node ParseExample/ParseExampleV2}}]] [Op:ReduceDataset]_

--Why there is a "Can't parse serialized Example." bug? Thanks very much for solving my question.