error： Invalid argument: cycle_length must be > 0

[AlexYoung757]

0.3.4版本，执行notebook示例：Run Self Defined Problem，出现以下错误：
InvalidArgumentError: 2 root error(s) found.
(0) Invalid argument: cycle_length must be > 0
[[node ExperimentalParallelInterleaveDataset (defined at /home/appadmin/anaconda3/envs/multi_task/lib/python3.6/site-packages/bert_multitask_learning-0.3.4-py3.6.egg/bert_multitask_learning/read_write_tfrecord.py:520) ]]
[[MultiDeviceIteratorToStringHandle/_8865]]
(1) Invalid argument: cycle_length must be > 0
[[node ExperimentalParallelInterleaveDataset (defined at /home/appadmin/anaconda3/envs/multi_task/lib/python3.6/site-packages/bert_multitask_learning-0.3.4-py3.6.egg/bert_multitask_learning/read_write_tfrecord.py:520) ]]
0 successful operations.
0 derived errors ignored.

运行环境如下：
tensorflow==1.14.0
keras==2.3.1
tensor2tensor==1.15.5

how to solve it