Ch19: Failed to create LSTM

When running 01_univariate_time_series_regression from Chapter 19, I got the following error. Then I downgraded my numpy version, but still got the same error. What are the recommended versions for tensorflow, etc? Thanks. --Patrick
NotImplementedError: Cannot convert a symbolic Tensor (LSTM/strided_slice:0) to a numpy array. This error may indicate that you’re trying to pass a Tensor to a NumPy call, which is not supported