AttributeError: 'NNAcousticPredictor' object has no attribute 'model'

[A-d-DASARE]

Traceback (most recent call last):
File "./scripts/speak.py", line 181, in
main_work()
File "./scripts/speak.py", line 131, in main_work
output_labfile=output_labfile)
File "/home/ashwini/Ossian/scripts/main/Voice.py", line 261, in synth_utterance
processor.apply_to_utt(utt, voice_mode=self.run_mode) ## utt is changed in place
File "/home/ashwini/Ossian/voices/en/ens_toy_demo/naive_01_nn/../../../../scripts/processors/UtteranceProcessor.py", line 222, in apply_to_utt
self.process_utterance(utterance)
File "/home/ashwini/Ossian/voices/en/ens_toy_demo/naive_01_nn/../../../../scripts/processors/NN.py", line 850, in process_utterance
streams = self.model.generate(label, variance_expansion=self.variance_expansion,
AttributeError: 'NNAcousticPredictor' object has no attribute 'model'

model got trained and i could save it too. but while synthesising voice this is the issue.