AttributeError: 'NoneType' object has no attribute 'inputs'

[lzh66]

Traceback (most recent call last):
File "main.py", line 37, in
main()
File "main.py", line 16, in main
graph, model, data_generator = create_graph(para)
File "D:\study\keyan\paper\TPA-LSTM-master\lib\model_utils.py", line 32, in create_graph
model = PolyRNN(para, data_generator)
File "D:\study\keyan\paper\TPA-LSTM-master\lib\model.py", line 14, in init
self._build_graph()
File "D:\study\keyan\paper\TPA-LSTM-master\lib\model.py", line 26, in _build_graph
self.rnn_inputs, self.rnn_inputs_len, self.target_outputs = self.data_generator.inputs(
AttributeError: 'NoneType' object has no attribute 'inputs'